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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
namespace System {
using System.Text;
using System.Threading;
using System.Globalization;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Versioning;
using System.Security;
using System.Diagnostics.Contracts;
/*
Customized format patterns:
P.S. Format in the table below is the internal number format used to display the pattern.
Patterns Format Description Example
========= ========== ===================================== ========
"h" "0" hour (12-hour clock)w/o leading zero 3
"hh" "00" hour (12-hour clock)with leading zero 03
"hh*" "00" hour (12-hour clock)with leading zero 03
"H" "0" hour (24-hour clock)w/o leading zero 8
"HH" "00" hour (24-hour clock)with leading zero 08
"HH*" "00" hour (24-hour clock) 08
"m" "0" minute w/o leading zero
"mm" "00" minute with leading zero
"mm*" "00" minute with leading zero
"s" "0" second w/o leading zero
"ss" "00" second with leading zero
"ss*" "00" second with leading zero
"f" "0" second fraction (1 digit)
"ff" "00" second fraction (2 digit)
"fff" "000" second fraction (3 digit)
"ffff" "0000" second fraction (4 digit)
"fffff" "00000" second fraction (5 digit)
"ffffff" "000000" second fraction (6 digit)
"fffffff" "0000000" second fraction (7 digit)
"F" "0" second fraction (up to 1 digit)
"FF" "00" second fraction (up to 2 digit)
"FFF" "000" second fraction (up to 3 digit)
"FFFF" "0000" second fraction (up to 4 digit)
"FFFFF" "00000" second fraction (up to 5 digit)
"FFFFFF" "000000" second fraction (up to 6 digit)
"FFFFFFF" "0000000" second fraction (up to 7 digit)
"t" first character of AM/PM designator A
"tt" AM/PM designator AM
"tt*" AM/PM designator PM
"d" "0" day w/o leading zero 1
"dd" "00" day with leading zero 01
"ddd" short weekday name (abbreviation) Mon
"dddd" full weekday name Monday
"dddd*" full weekday name Monday
"M" "0" month w/o leading zero 2
"MM" "00" month with leading zero 02
"MMM" short month name (abbreviation) Feb
"MMMM" full month name Febuary
"MMMM*" full month name Febuary
"y" "0" two digit year (year % 100) w/o leading zero 0
"yy" "00" two digit year (year % 100) with leading zero 00
"yyy" "D3" year 2000
"yyyy" "D4" year 2000
"yyyyy" "D5" year 2000
...
"z" "+0;-0" timezone offset w/o leading zero -8
"zz" "+00;-00" timezone offset with leading zero -08
"zzz" "+00;-00" for hour offset, "00" for minute offset full timezone offset -07:30
"zzz*" "+00;-00" for hour offset, "00" for minute offset full timezone offset -08:00
"K" -Local "zzz", e.g. -08:00
-Utc "'Z'", representing UTC
-Unspecified ""
-DateTimeOffset "zzzzz" e.g -07:30:15
"g*" the current era name A.D.
":" time separator : -- DEPRECATED - Insert separator directly into pattern (eg: "H.mm.ss")
"/" date separator /-- DEPRECATED - Insert separator directly into pattern (eg: "M-dd-yyyy")
"'" quoted string 'ABC' will insert ABC into the formatted string.
'"' quoted string "ABC" will insert ABC into the formatted string.
"%" used to quote a single pattern characters E.g.The format character "%y" is to print two digit year.
"\" escaped character E.g. '\d' insert the character 'd' into the format string.
other characters insert the character into the format string.
Pre-defined format characters:
(U) to indicate Universal time is used.
(G) to indicate Gregorian calendar is used.
Format Description Real format Example
========= ================================= ====================== =======================
"d" short date culture-specific 10/31/1999
"D" long data culture-specific Sunday, October 31, 1999
"f" full date (long date + short time) culture-specific Sunday, October 31, 1999 2:00 AM
"F" full date (long date + long time) culture-specific Sunday, October 31, 1999 2:00:00 AM
"g" general date (short date + short time) culture-specific 10/31/1999 2:00 AM
"G" general date (short date + long time) culture-specific 10/31/1999 2:00:00 AM
"m"/"M" Month/Day date culture-specific October 31
(G) "o"/"O" Round Trip XML "yyyy-MM-ddTHH:mm:ss.fffffffK" 1999-10-31 02:00:00.0000000Z
(G) "r"/"R" RFC 1123 date, "ddd, dd MMM yyyy HH':'mm':'ss 'GMT'" Sun, 31 Oct 1999 10:00:00 GMT
(G) "s" Sortable format, based on ISO 8601. "yyyy-MM-dd'T'HH:mm:ss" 1999-10-31T02:00:00
('T' for local time)
"t" short time culture-specific 2:00 AM
"T" long time culture-specific 2:00:00 AM
(G) "u" Universal time with sortable format, "yyyy'-'MM'-'dd HH':'mm':'ss'Z'" 1999-10-31 10:00:00Z
based on ISO 8601.
(U) "U" Universal time with full culture-specific Sunday, October 31, 1999 10:00:00 AM
(long date + long time) format
"y"/"Y" Year/Month day culture-specific October, 1999
*/
//This class contains only static members and does not require the serializable attribute.
internal static
class DateTimeFormat {
internal const int MaxSecondsFractionDigits = 7;
internal static readonly TimeSpan NullOffset = TimeSpan.MinValue;
internal static char[] allStandardFormats =
{
'd', 'D', 'f', 'F', 'g', 'G',
'm', 'M', 'o', 'O', 'r', 'R',
's', 't', 'T', 'u', 'U', 'y', 'Y',
};
internal const String RoundtripFormat = "yyyy'-'MM'-'dd'T'HH':'mm':'ss.fffffffK";
internal const String RoundtripDateTimeUnfixed = "yyyy'-'MM'-'ddTHH':'mm':'ss zzz";
private const int DEFAULT_ALL_DATETIMES_SIZE = 132;
internal static readonly DateTimeFormatInfo InvariantFormatInfo = CultureInfo.InvariantCulture.DateTimeFormat;
internal static readonly string[] InvariantAbbreviatedMonthNames = InvariantFormatInfo.AbbreviatedMonthNames;
internal static readonly string[] InvariantAbbreviatedDayNames = InvariantFormatInfo.AbbreviatedDayNames;
internal const string Gmt = "GMT";
internal static String[] fixedNumberFormats = new String[] {
"0",
"00",
"000",
"0000",
"00000",
"000000",
"0000000",
};
////////////////////////////////////////////////////////////////////////////
//
// Format the positive integer value to a string and perfix with assigned
// length of leading zero.
//
// Parameters:
// value: The value to format
// len: The maximum length for leading zero.
// If the digits of the value is greater than len, no leading zero is added.
//
// Notes:
// The function can format to Int32.MaxValue.
//
////////////////////////////////////////////////////////////////////////////
internal static void FormatDigits(StringBuilder outputBuffer, int value, int len) {
Contract.Assert(value >= 0, "DateTimeFormat.FormatDigits(): value >= 0");
FormatDigits(outputBuffer, value, len, false);
}
[System.Security.SecuritySafeCritical] // auto-generated
internal unsafe static void FormatDigits(StringBuilder outputBuffer, int value, int len, bool overrideLengthLimit) {
Contract.Assert(value >= 0, "DateTimeFormat.FormatDigits(): value >= 0");
// Limit the use of this function to be two-digits, so that we have the same behavior
// as RTM bits.
if (!overrideLengthLimit && len > 2)
{
len = 2;
}
char* buffer = stackalloc char[16];
char* p = buffer + 16;
int n = value;
do {
*--p = (char)(n % 10 + '0');
n /= 10;
} while ((n != 0)&&(p > buffer));
int digits = (int) (buffer + 16 - p);
//If the repeat count is greater than 0, we're trying
//to emulate the "00" format, so we have to prepend
//a zero if the string only has one character.
while ((digits < len) && (p > buffer)) {
*--p='0';
digits++;
}
outputBuffer.Append(p, digits);
}
private static void HebrewFormatDigits(StringBuilder outputBuffer, int digits) {
outputBuffer.Append(HebrewNumber.ToString(digits));
}
internal static int ParseRepeatPattern(String format, int pos, char patternChar)
{
int len = format.Length;
int index = pos + 1;
while ((index < len) && (format[index] == patternChar))
{
index++;
}
return (index - pos);
}
private static String FormatDayOfWeek(int dayOfWeek, int repeat, DateTimeFormatInfo dtfi)
{
Contract.Assert(dayOfWeek >= 0 && dayOfWeek <= 6, "dayOfWeek >= 0 && dayOfWeek <= 6");
if (repeat == 3)
{
return (dtfi.GetAbbreviatedDayName((DayOfWeek)dayOfWeek));
}
// Call dtfi.GetDayName() here, instead of accessing DayNames property, because we don't
// want a clone of DayNames, which will hurt perf.
return (dtfi.GetDayName((DayOfWeek)dayOfWeek));
}
private static String FormatMonth(int month, int repeatCount, DateTimeFormatInfo dtfi)
{
Contract.Assert(month >=1 && month <= 12, "month >=1 && month <= 12");
if (repeatCount == 3)
{
return (dtfi.GetAbbreviatedMonthName(month));
}
// Call GetMonthName() here, instead of accessing MonthNames property, because we don't
// want a clone of MonthNames, which will hurt perf.
return (dtfi.GetMonthName(month));
}
//
// FormatHebrewMonthName
//
// Action: Return the Hebrew month name for the specified DateTime.
// Returns: The month name string for the specified DateTime.
// Arguments:
// time the time to format
// month The month is the value of HebrewCalendar.GetMonth(time).
// repeat Return abbreviated month name if repeat=3, or full month name if repeat=4
// dtfi The DateTimeFormatInfo which uses the Hebrew calendars as its calendar.
// Exceptions: None.
//
/* Note:
If DTFI is using Hebrew calendar, GetMonthName()/GetAbbreviatedMonthName() will return month names like this:
1 Hebrew 1st Month
2 Hebrew 2nd Month
.. ...
6 Hebrew 6th Month
7 Hebrew 6th Month II (used only in a leap year)
8 Hebrew 7th Month
9 Hebrew 8th Month
10 Hebrew 9th Month
11 Hebrew 10th Month
12 Hebrew 11th Month
13 Hebrew 12th Month
Therefore, if we are in a regular year, we have to increment the month name if moth is greater or eqaul to 7.
*/
private static String FormatHebrewMonthName(DateTime time, int month, int repeatCount, DateTimeFormatInfo dtfi)
{
Contract.Assert(repeatCount != 3 || repeatCount != 4, "repeateCount should be 3 or 4");
if (dtfi.Calendar.IsLeapYear(dtfi.Calendar.GetYear(time))) {
// This month is in a leap year
return (dtfi.internalGetMonthName(month, MonthNameStyles.LeapYear, (repeatCount == 3)));
}
// This is in a regular year.
if (month >= 7) {
month++;
}
if (repeatCount == 3) {
return (dtfi.GetAbbreviatedMonthName(month));
}
return (dtfi.GetMonthName(month));
}
//
// The pos should point to a quote character. This method will
// get the string encloed by the quote character.
//
internal static int ParseQuoteString(String format, int pos, StringBuilder result)
{
//
// NOTE : pos will be the index of the quote character in the 'format' string.
//
int formatLen = format.Length;
int beginPos = pos;
char quoteChar = format[pos++]; // Get the character used to quote the following string.
bool foundQuote = false;
while (pos < formatLen)
{
char ch = format[pos++];
if (ch == quoteChar)
{
foundQuote = true;
break;
}
else if (ch == '\\') {
// The following are used to support escaped character.
// Escaped character is also supported in the quoted string.
// Therefore, someone can use a format like "'minute:' mm\"" to display:
// minute: 45"
// because the second double quote is escaped.
if (pos < formatLen) {
result.Append(format[pos++]);
} else {
//
// This means that '\' is at the end of the formatting string.
//
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
} else {
result.Append(ch);
}
}
if (!foundQuote)
{
// Here we can't find the matching quote.
throw new FormatException(
String.Format(
CultureInfo.CurrentCulture,
Environment.GetResourceString("Format_BadQuote"), quoteChar));
}
//
// Return the character count including the begin/end quote characters and enclosed string.
//
return (pos - beginPos);
}
//
// Get the next character at the index of 'pos' in the 'format' string.
// Return value of -1 means 'pos' is already at the end of the 'format' string.
// Otherwise, return value is the int value of the next character.
//
internal static int ParseNextChar(String format, int pos)
{
if (pos >= format.Length - 1)
{
return (-1);
}
return ((int)format[pos+1]);
}
//
// IsUseGenitiveForm
//
// Actions: Check the format to see if we should use genitive month in the formatting.
// Starting at the position (index) in the (format) string, look back and look ahead to
// see if there is "d" or "dd". In the case like "d MMMM" or "MMMM dd", we can use
// genitive form. Genitive form is not used if there is more than two "d".
// Arguments:
// format The format string to be scanned.
// index Where we should start the scanning. This is generally where "M" starts.
// tokenLen The len of the current pattern character. This indicates how many "M" that we have.
// patternToMatch The pattern that we want to search. This generally uses "d"
//
private static bool IsUseGenitiveForm(String format, int index, int tokenLen, char patternToMatch) {
int i;
int repeat = 0;
//
// Look back to see if we can find "d" or "ddd"
//
// Find first "d".
for (i = index - 1; i >= 0 && format[i] != patternToMatch; i--) { /*Do nothing here */ };
if (i >= 0) {
// Find a "d", so look back to see how many "d" that we can find.
while (--i >= 0 && format[i] == patternToMatch) {
repeat++;
}
//
// repeat == 0 means that we have one (patternToMatch)
// repeat == 1 means that we have two (patternToMatch)
//
if (repeat <= 1) {
return (true);
}
// Note that we can't just stop here. We may find "ddd" while looking back, and we have to look
// ahead to see if there is "d" or "dd".
}
//
// If we can't find "d" or "dd" by looking back, try look ahead.
//
// Find first "d"
for (i = index + tokenLen; i < format.Length && format[i] != patternToMatch; i++) { /* Do nothing here */ };
if (i < format.Length) {
repeat = 0;
// Find a "d", so contine the walk to see how may "d" that we can find.
while (++i < format.Length && format[i] == patternToMatch) {
repeat++;
}
//
// repeat == 0 means that we have one (patternToMatch)
// repeat == 1 means that we have two (patternToMatch)
//
if (repeat <= 1) {
return (true);
}
}
return (false);
}
//
// FormatCustomized
//
// Actions: Format the DateTime instance using the specified format.
//
private static String FormatCustomized(DateTime dateTime, String format, DateTimeFormatInfo dtfi, TimeSpan offset) {
Calendar cal = dtfi.Calendar;
StringBuilder result = StringBuilderCache.Acquire();
// This is a flag to indicate if we are format the dates using Hebrew calendar.
bool isHebrewCalendar = (cal.ID == Calendar.CAL_HEBREW);
bool isJapaneseCalendar = (cal.ID == Calendar.CAL_JAPAN);
// This is a flag to indicate if we are formating hour/minute/second only.
bool bTimeOnly = true;
int i = 0;
int tokenLen, hour12;
while (i < format.Length) {
char ch = format[i];
int nextChar;
switch (ch) {
case 'g':
tokenLen = ParseRepeatPattern(format, i, ch);
result.Append(dtfi.GetEraName(cal.GetEra(dateTime)));
break;
case 'h':
tokenLen = ParseRepeatPattern(format, i, ch);
hour12 = dateTime.Hour % 12;
if (hour12 == 0)
{
hour12 = 12;
}
FormatDigits(result, hour12, tokenLen);
break;
case 'H':
tokenLen = ParseRepeatPattern(format, i, ch);
FormatDigits(result, dateTime.Hour, tokenLen);
break;
case 'm':
tokenLen = ParseRepeatPattern(format, i, ch);
FormatDigits(result, dateTime.Minute, tokenLen);
break;
case 's':
tokenLen = ParseRepeatPattern(format, i, ch);
FormatDigits(result, dateTime.Second, tokenLen);
break;
case 'f':
case 'F':
tokenLen = ParseRepeatPattern(format, i, ch);
if (tokenLen <= MaxSecondsFractionDigits) {
long fraction = (dateTime.Ticks % Calendar.TicksPerSecond);
fraction = fraction / (long)Math.Pow(10, 7 - tokenLen);
if (ch == 'f') {
result.Append(((int)fraction).ToString(fixedNumberFormats[tokenLen - 1], CultureInfo.InvariantCulture));
}
else {
int effectiveDigits = tokenLen;
while (effectiveDigits > 0) {
if (fraction % 10 == 0) {
fraction = fraction / 10;
effectiveDigits--;
}
else {
break;
}
}
if (effectiveDigits > 0) {
result.Append(((int)fraction).ToString(fixedNumberFormats[effectiveDigits - 1], CultureInfo.InvariantCulture));
}
else {
// No fraction to emit, so see if we should remove decimal also.
if (result.Length > 0 && result[result.Length - 1] == '.') {
result.Remove(result.Length - 1, 1);
}
}
}
} else {
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
break;
case 't':
tokenLen = ParseRepeatPattern(format, i, ch);
if (tokenLen == 1)
{
if (dateTime.Hour < 12)
{
if (dtfi.AMDesignator.Length >= 1)
{
result.Append(dtfi.AMDesignator[0]);
}
}
else
{
if (dtfi.PMDesignator.Length >= 1)
{
result.Append(dtfi.PMDesignator[0]);
}
}
}
else
{
result.Append((dateTime.Hour < 12 ? dtfi.AMDesignator : dtfi.PMDesignator));
}
break;
case 'd':
//
// tokenLen == 1 : Day of month as digits with no leading zero.
// tokenLen == 2 : Day of month as digits with leading zero for single-digit months.
// tokenLen == 3 : Day of week as a three-leter abbreviation.
// tokenLen >= 4 : Day of week as its full name.
//
tokenLen = ParseRepeatPattern(format, i, ch);
if (tokenLen <= 2)
{
int day = cal.GetDayOfMonth(dateTime);
if (isHebrewCalendar) {
// For Hebrew calendar, we need to convert numbers to Hebrew text for yyyy, MM, and dd values.
HebrewFormatDigits(result, day);
} else {
FormatDigits(result, day, tokenLen);
}
}
else
{
int dayOfWeek = (int)cal.GetDayOfWeek(dateTime);
result.Append(FormatDayOfWeek(dayOfWeek, tokenLen, dtfi));
}
bTimeOnly = false;
break;
case 'M':
//
// tokenLen == 1 : Month as digits with no leading zero.
// tokenLen == 2 : Month as digits with leading zero for single-digit months.
// tokenLen == 3 : Month as a three-letter abbreviation.
// tokenLen >= 4 : Month as its full name.
//
tokenLen = ParseRepeatPattern(format, i, ch);
int month = cal.GetMonth(dateTime);
if (tokenLen <= 2)
{
if (isHebrewCalendar) {
// For Hebrew calendar, we need to convert numbers to Hebrew text for yyyy, MM, and dd values.
HebrewFormatDigits(result, month);
} else {
FormatDigits(result, month, tokenLen);
}
}
else {
if (isHebrewCalendar) {
result.Append(FormatHebrewMonthName(dateTime, month, tokenLen, dtfi));
} else {
if ((dtfi.FormatFlags & DateTimeFormatFlags.UseGenitiveMonth) != 0 && tokenLen >= 4) {
result.Append(
dtfi.internalGetMonthName(
month,
IsUseGenitiveForm(format, i, tokenLen, 'd')? MonthNameStyles.Genitive : MonthNameStyles.Regular,
false));
} else {
result.Append(FormatMonth(month, tokenLen, dtfi));
}
}
}
bTimeOnly = false;
break;
case 'y':
// Notes about OS behavior:
// y: Always print (year % 100). No leading zero.
// yy: Always print (year % 100) with leading zero.
// yyy/yyyy/yyyyy/... : Print year value. No leading zero.
int year = cal.GetYear(dateTime);
tokenLen = ParseRepeatPattern(format, i, ch);
if (isJapaneseCalendar &&
!AppContextSwitches.FormatJapaneseFirstYearAsANumber &&
year == 1 &&
((i + tokenLen < format.Length && format[i + tokenLen] == DateTimeFormatInfoScanner.CJKYearSuff[0]) ||
(i + tokenLen < format.Length - 1 && format[i + tokenLen] == '\'' && format[i + tokenLen + 1] == DateTimeFormatInfoScanner.CJKYearSuff[0])))
{
// We are formatting a Japanese date with year equals 1 and the year number is followed by the year sign \u5e74
// In Japanese dates, the first year in the era is not formatted as a number 1 instead it is formatted as \u5143 which means
// first or beginning of the era.
result.Append(DateTimeFormatInfo.JapaneseEraStart[0]);
}
else if (dtfi.HasForceTwoDigitYears) {
FormatDigits(result, year, tokenLen <= 2 ? tokenLen : 2);
}
else if (cal.ID == Calendar.CAL_HEBREW) {
HebrewFormatDigits(result, year);
}
else {
if (tokenLen <= 2) {
FormatDigits(result, year % 100, tokenLen);
}
else {
String fmtPattern = "D" + tokenLen;
result.Append(year.ToString(fmtPattern, CultureInfo.InvariantCulture));
}
}
bTimeOnly = false;
break;
case 'z':
tokenLen = ParseRepeatPattern(format, i, ch);
FormatCustomizedTimeZone(dateTime, offset, format, tokenLen, bTimeOnly, result);
break;
case 'K':
tokenLen = 1;
FormatCustomizedRoundripTimeZone(dateTime, offset, result);
break;
case ':':
result.Append(dtfi.TimeSeparator);
tokenLen = 1;
break;
case '/':
result.Append(dtfi.DateSeparator);
tokenLen = 1;
break;
case '\'':
case '\"':
StringBuilder enquotedString = new StringBuilder();
tokenLen = ParseQuoteString(format, i, enquotedString);
result.Append(enquotedString);
break;
case '%':
// Optional format character.
// For example, format string "%d" will print day of month
// without leading zero. Most of the cases, "%" can be ignored.
nextChar = ParseNextChar(format, i);
// nextChar will be -1 if we already reach the end of the format string.
// Besides, we will not allow "%%" appear in the pattern.
if (nextChar >= 0 && nextChar != (int)'%') {
result.Append(FormatCustomized(dateTime, ((char)nextChar).ToString(), dtfi, offset));
tokenLen = 2;
}
else
{
//
// This means that '%' is at the end of the format string or
// "%%" appears in the format string.
//
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
break;
case '\\':
// Escaped character. Can be used to insert character into the format string.
// For exmple, "\d" will insert the character 'd' into the string.
//
// NOTENOTE : we can remove this format character if we enforce the enforced quote
// character rule.
// That is, we ask everyone to use single quote or double quote to insert characters,
// then we can remove this character.
//
nextChar = ParseNextChar(format, i);
if (nextChar >= 0)
{
result.Append(((char)nextChar));
tokenLen = 2;
}
else
{
//
// This means that '\' is at the end of the formatting string.
//
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
break;
default:
// NOTENOTE : we can remove this rule if we enforce the enforced quote
// character rule.
// That is, if we ask everyone to use single quote or double quote to insert characters,
// then we can remove this default block.
result.Append(ch);
tokenLen = 1;
break;
}
i += tokenLen;
}
return StringBuilderCache.GetStringAndRelease(result);
}
// output the 'z' famliy of formats, which output a the offset from UTC, e.g. "-07:30"
private static void FormatCustomizedTimeZone(DateTime dateTime, TimeSpan offset, String format, Int32 tokenLen, Boolean timeOnly, StringBuilder result) {
// See if the instance already has an offset
Boolean dateTimeFormat = (offset == NullOffset);
if (dateTimeFormat) {
// No offset. The instance is a DateTime and the output should be the local time zone
if (timeOnly && dateTime.Ticks < Calendar.TicksPerDay) {
// For time only format and a time only input, the time offset on 0001/01/01 is less
// accurate than the system's current offset because of daylight saving time.
offset = TimeZoneInfo.GetLocalUtcOffset(DateTime.Now, TimeZoneInfoOptions.NoThrowOnInvalidTime);
} else if (dateTime.Kind == DateTimeKind.Utc) {
#if FEATURE_CORECLR
offset = TimeSpan.Zero;
#else // FEATURE_CORECLR
// This code path points to a bug in user code. It would make sense to return a 0 offset in this case.
// However, because it was only possible to detect this in Whidbey, there is user code that takes a
// dependency on being serialize a UTC DateTime using the 'z' format, and it will work almost all the
// time if it is offset by an incorrect conversion to local time when parsed. Therefore, we need to
// explicitly emit the local time offset, which we can do by removing the UTC flag.
InvalidFormatForUtc(format, dateTime);
dateTime = DateTime.SpecifyKind(dateTime, DateTimeKind.Local);
offset = TimeZoneInfo.GetLocalUtcOffset(dateTime, TimeZoneInfoOptions.NoThrowOnInvalidTime);
#endif // FEATURE_CORECLR
} else {
offset = TimeZoneInfo.GetLocalUtcOffset(dateTime, TimeZoneInfoOptions.NoThrowOnInvalidTime);
}
}
if (offset >= TimeSpan.Zero) {
result.Append('+');
}
else {
result.Append('-');
// get a positive offset, so that you don't need a separate code path for the negative numbers.
offset = offset.Negate();
}
if (tokenLen <= 1) {
// 'z' format e.g "-7"
result.AppendFormat(CultureInfo.InvariantCulture, "{0:0}", offset.Hours);
}
else {
// 'zz' or longer format e.g "-07"
result.AppendFormat(CultureInfo.InvariantCulture, "{0:00}", offset.Hours);
if (tokenLen >= 3) {
// 'zzz*' or longer format e.g "-07:30"
result.AppendFormat(CultureInfo.InvariantCulture, ":{0:00}", offset.Minutes);
}
}
}
// output the 'K' format, which is for round-tripping the data
private static void FormatCustomizedRoundripTimeZone(DateTime dateTime, TimeSpan offset, StringBuilder result) {
// The objective of this format is to round trip the data in the type
// For DateTime it should round-trip the Kind value and preserve the time zone.
// DateTimeOffset instance, it should do so by using the internal time zone.
if (offset == NullOffset) {
// source is a date time, so behavior depends on the kind.
switch (dateTime.Kind) {
case DateTimeKind.Local:
// This should output the local offset, e.g. "-07:30"
offset = TimeZoneInfo.GetLocalUtcOffset(dateTime, TimeZoneInfoOptions.NoThrowOnInvalidTime);
// fall through to shared time zone output code
break;
case DateTimeKind.Utc:
// The 'Z' constant is a marker for a UTC date
result.Append("Z");
return;
default:
// If the kind is unspecified, we output nothing here
return;
}
}
if (offset >= TimeSpan.Zero) {
result.Append('+');
}
else {
result.Append('-');
// get a positive offset, so that you don't need a separate code path for the negative numbers.
offset = offset.Negate();
}
result.AppendFormat(CultureInfo.InvariantCulture, "{0:00}:{1:00}", offset.Hours, offset.Minutes);
}
internal static String GetRealFormat(String format, DateTimeFormatInfo dtfi)
{
String realFormat = null;
switch (format[0])
{
case 'd': // Short Date
realFormat = dtfi.ShortDatePattern;
break;
case 'D': // Long Date
realFormat = dtfi.LongDatePattern;
break;
case 'f': // Full (long date + short time)
realFormat = dtfi.LongDatePattern + " " + dtfi.ShortTimePattern;
break;
case 'F': // Full (long date + long time)
realFormat = dtfi.FullDateTimePattern;
break;
case 'g': // General (short date + short time)
realFormat = dtfi.GeneralShortTimePattern;
break;
case 'G': // General (short date + long time)
realFormat = dtfi.GeneralLongTimePattern;
break;
case 'm':
case 'M': // Month/Day Date
realFormat = dtfi.MonthDayPattern;
break;
case 'o':
case 'O':
realFormat = RoundtripFormat;
break;
case 'r':
case 'R': // RFC 1123 Standard
realFormat = dtfi.RFC1123Pattern;
break;
case 's': // Sortable without Time Zone Info
realFormat = dtfi.SortableDateTimePattern;
break;
case 't': // Short Time
realFormat = dtfi.ShortTimePattern;
break;
case 'T': // Long Time
realFormat = dtfi.LongTimePattern;
break;
case 'u': // Universal with Sortable format
realFormat = dtfi.UniversalSortableDateTimePattern;
break;
case 'U': // Universal with Full (long date + long time) format
realFormat = dtfi.FullDateTimePattern;
break;
case 'y':
case 'Y': // Year/Month Date
realFormat = dtfi.YearMonthPattern;
break;
default:
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
return (realFormat);
}
// Expand a pre-defined format string (like "D" for long date) to the real format that
// we are going to use in the date time parsing.
// This method also convert the dateTime if necessary (e.g. when the format is in Universal time),
// and change dtfi if necessary (e.g. when the format should use invariant culture).
//
private static String ExpandPredefinedFormat(String format, ref DateTime dateTime, ref DateTimeFormatInfo dtfi, ref TimeSpan offset) {
switch (format[0]) {
case 's': // Sortable without Time Zone Info
dtfi = DateTimeFormatInfo.InvariantInfo;
break;
case 'u': // Universal time in sortable format.
if (offset != NullOffset) {
// Convert to UTC invariants mean this will be in range
dateTime = dateTime - offset;
}
else if (dateTime.Kind == DateTimeKind.Local) {
InvalidFormatForLocal(format, dateTime);
}
dtfi = DateTimeFormatInfo.InvariantInfo;
break;
case 'U': // Universal time in culture dependent format.
if (offset != NullOffset) {
// This format is not supported by DateTimeOffset
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
// Universal time is always in Greogrian calendar.
//
// Change the Calendar to be Gregorian Calendar.
//
dtfi = (DateTimeFormatInfo)dtfi.Clone();
if (dtfi.Calendar.GetType() != typeof(GregorianCalendar)) {
dtfi.Calendar = GregorianCalendar.GetDefaultInstance();
}
dateTime = dateTime.ToUniversalTime();
break;
}
format = GetRealFormat(format, dtfi);
return (format);
}
internal static String Format(DateTime dateTime, String format, DateTimeFormatInfo dtfi) {
return Format(dateTime, format, dtfi, NullOffset);
}
internal static String Format(DateTime dateTime, String format, DateTimeFormatInfo dtfi, TimeSpan offset)
{
Contract.Requires(dtfi != null);
if (format==null || format.Length==0) {
Boolean timeOnlySpecialCase = false;
if (dateTime.Ticks < Calendar.TicksPerDay) {
// If the time is less than 1 day, consider it as time of day.
// Just print out the short time format.
//
// This is a workaround for VB, since they use ticks less then one day to be
// time of day. In cultures which use calendar other than Gregorian calendar, these
// alternative calendar may not support ticks less than a day.
// For example, Japanese calendar only supports date after 1868/9/8.
// This will pose a problem when people in VB get the time of day, and use it
// to call ToString(), which will use the general format (short date + long time).
// Since Japanese calendar does not support Gregorian year 0001, an exception will be
// thrown when we try to get the Japanese year for Gregorian year 0001.
// Therefore, the workaround allows them to call ToString() for time of day from a DateTime by
// formatting as ISO 8601 format.
switch (dtfi.Calendar.ID) {
case Calendar.CAL_JAPAN:
case Calendar.CAL_TAIWAN:
case Calendar.CAL_HIJRI:
case Calendar.CAL_HEBREW:
case Calendar.CAL_JULIAN:
case Calendar.CAL_UMALQURA:
case Calendar.CAL_PERSIAN:
timeOnlySpecialCase = true;
dtfi = DateTimeFormatInfo.InvariantInfo;
break;
}
}
if (offset == NullOffset) {
// Default DateTime.ToString case.
if (timeOnlySpecialCase) {
format = "s";
}
else {
format = "G";
}
}
else {
// Default DateTimeOffset.ToString case.
if (timeOnlySpecialCase) {
format = RoundtripDateTimeUnfixed;
}
else {
format = dtfi.DateTimeOffsetPattern;
}
}
}
if (format.Length == 1) {
switch (format[0]) {
case 'O':
case 'o':
return StringBuilderCache.GetStringAndRelease(FastFormatRoundtrip(dateTime, offset));
case 'R':
case 'r':
return StringBuilderCache.GetStringAndRelease(FastFormatRfc1123(dateTime, offset, dtfi));
}
format = ExpandPredefinedFormat(format, ref dateTime, ref dtfi, ref offset);
}
return FormatCustomized(dateTime, format, dtfi, offset);
}
internal static StringBuilder FastFormatRfc1123(DateTime dateTime, TimeSpan offset, DateTimeFormatInfo dtfi)
{
// ddd, dd MMM yyyy HH:mm:ss GMT
const int Rfc1123FormatLength = 29;
StringBuilder result = StringBuilderCache.Acquire(Rfc1123FormatLength);
if (offset != NullOffset)
{
// Convert to UTC invariants
dateTime = dateTime - offset;
}
int year, month, day;
dateTime.GetDatePart(out year, out month, out day);
result.Append(InvariantAbbreviatedDayNames[(int)dateTime.DayOfWeek]);
result.Append(',');
result.Append(' ');
AppendNumber(result, day, 2);
result.Append(' ');
result.Append(InvariantAbbreviatedMonthNames[month - 1]);
result.Append(' ');
AppendNumber(result, year, 4);
result.Append(' ');
AppendHHmmssTimeOfDay(result, dateTime);
result.Append(' ');
result.Append(Gmt);
return result;
}
internal static StringBuilder FastFormatRoundtrip(DateTime dateTime, TimeSpan offset)
{
// yyyy-MM-ddTHH:mm:ss.fffffffK
const int roundTripFormatLength = 28;
StringBuilder result = StringBuilderCache.Acquire(roundTripFormatLength);
int year, month, day;
dateTime.GetDatePart(out year, out month, out day);
AppendNumber(result, year, 4);
result.Append('-');
AppendNumber(result, month, 2);
result.Append('-');
AppendNumber(result, day, 2);
result.Append('T');
AppendHHmmssTimeOfDay(result, dateTime);
result.Append('.');
long fraction = dateTime.Ticks % TimeSpan.TicksPerSecond;
AppendNumber(result, fraction, 7);
FormatCustomizedRoundripTimeZone(dateTime, offset, result);
return result;
}
private static void AppendHHmmssTimeOfDay(StringBuilder result, DateTime dateTime)
{
// HH:mm:ss
AppendNumber(result, dateTime.Hour, 2);
result.Append(':');
AppendNumber(result, dateTime.Minute, 2);
result.Append(':');
AppendNumber(result, dateTime.Second, 2);
}
internal static void AppendNumber(StringBuilder builder, long val, int digits)
{
for (int i = 0; i < digits; i++)
{
builder.Append('0');
}
int index = 1;
while (val > 0 && index <= digits)
{
builder[builder.Length - index] = (char)('0' + (val % 10));
val = val / 10;
index++;
}
BCLDebug.Assert(val == 0, "DateTimeFormat.AppendNumber(): digits less than size of val");
}
internal static String[] GetAllDateTimes(DateTime dateTime, char format, DateTimeFormatInfo dtfi)
{
Contract.Requires(dtfi != null);
String [] allFormats = null;
String [] results = null;
switch (format)
{
case 'd':
case 'D':
case 'f':
case 'F':
case 'g':
case 'G':
case 'm':
case 'M':
case 't':
case 'T':
case 'y':
case 'Y':
allFormats = dtfi.GetAllDateTimePatterns(format);
results = new String[allFormats.Length];
for (int i = 0; i < allFormats.Length; i++)
{
results[i] = Format(dateTime, allFormats[i], dtfi);
}
break;
case 'U':
DateTime universalTime = dateTime.ToUniversalTime();
allFormats = dtfi.GetAllDateTimePatterns(format);
results = new String[allFormats.Length];
for (int i = 0; i < allFormats.Length; i++)
{
results[i] = Format(universalTime, allFormats[i], dtfi);
}
break;
//
// The following ones are special cases because these patterns are read-only in
// DateTimeFormatInfo.
//
case 'r':
case 'R':
case 'o':
case 'O':
case 's':
case 'u':
results = new String[] {Format(dateTime, new String(new char[] {format}), dtfi)};
break;
default:
throw new FormatException(Environment.GetResourceString("Format_InvalidString"));
}
return (results);
}
internal static String[] GetAllDateTimes(DateTime dateTime, DateTimeFormatInfo dtfi)
{
List<String> results = new List<String>(DEFAULT_ALL_DATETIMES_SIZE);
for (int i = 0; i < allStandardFormats.Length; i++)
{
String[] strings = GetAllDateTimes(dateTime, allStandardFormats[i], dtfi);
for (int j = 0; j < strings.Length; j++)
{
results.Add(strings[j]);
}
}
String[] value = new String[results.Count];
results.CopyTo(0, value, 0, results.Count);
return (value);
}
// This is a placeholder for an MDA to detect when the user is using a
// local DateTime with a format that will be interpreted as UTC.
internal static void InvalidFormatForLocal(String format, DateTime dateTime) {
}
// This is an MDA for cases when the user is using a local format with
// a Utc DateTime.
[System.Security.SecuritySafeCritical] // auto-generated
internal static void InvalidFormatForUtc(String format, DateTime dateTime) {
#if MDA_SUPPORTED
Mda.DateTimeInvalidLocalFormat();
#endif
}
}
}
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