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A date and time format string defines the text representation of a DateTime or DateTimeOffset value that results from a formatting operation. It can also define the representation of a date and time value that is required in a parsing operation in order to successfully convert the string to a date and time. A custom format string consists of one or more custom date and time format specifiers. Any string that is not a standard date and time format string is interpreted as a custom date and time format string.

In formatting operations, custom date and time format strings can be used either with the ToString method of a date and time instance or with a method that supports composite formatting. The following example illustrates both uses.

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In parsing operations, custom date and time format strings can be used with the DateTime.ParseExact, DateTime.TryParseExact, DateTimeOffset.ParseExact, and DateTimeOffset.TryParseExact methods. These methods require that an input string conforms exactly to a particular pattern for the parse operation to succeed. The following example illustrates a call to the DateTimeOffset.ParseExact(String, String, IFormatProvider) method to parse a date that must include a day, a month, and a two-digit year.

The following table describes the custom date and time format specifiers and displays a result string produced by each format specifier. By default, result strings reflect the formatting conventions of the en-US culture. If a particular format specifier produces a localized result string, the example also notes the culture to which the result string applies. For more information about using custom date and time format strings, see the Notes section.

The following sections provide additional information about each custom date and time format specifier. Unless otherwise noted, each specifier produces an identical string representation regardless of whether it's used with a DateTime value or a DateTimeOffset value.

If the "d" format specifier is used without other custom format specifiers, it's interpreted as the "d" standard date and time format specifier. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "ddd" custom format specifier represents the abbreviated name of the day of the week. The localized abbreviated name of the day of the week is retrieved from the DateTimeFormatInfo.AbbreviatedDayNames property of the current or specified culture.

The "dddd" custom format specifier (plus any number of additional "d" specifiers) represents the full name of the day of the week. The localized name of the day of the week is retrieved from the DateTimeFormatInfo.DayNames property of the current or specified culture.

The "F" custom format specifier represents the most significant digit of the seconds fraction; that is, it represents the tenths of a second in a date and time value. Nothing is displayed if the digit is zero, and the decimal point that follows the number of seconds is also not displayed.

The "FF" custom format specifier represents the two most significant digits of the seconds fraction; that is, it represents the hundredths of a second in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the two significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "FFF" custom format specifier represents the three most significant digits of the seconds fraction; that is, it represents the milliseconds in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the three significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "FFFF" custom format specifier represents the four most significant digits of the seconds fraction; that is, it represents the ten thousandths of a second in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the four significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "FFFFF" custom format specifier represents the five most significant digits of the seconds fraction; that is, it represents the hundred thousandths of a second in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the five significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "FFFFFF" custom format specifier represents the six most significant digits of the seconds fraction; that is, it represents the millionths of a second in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the six significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "FFFFFFF" custom format specifier represents the seven most significant digits of the seconds fraction; that is, it represents the ten millionths of a second in a date and time value. Trailing zeros aren't displayed. Nothing is displayed if the seven significant digits are zero, and in that case the decimal point that follows the number of seconds is also not displayed.

The "g" or "gg" custom format specifiers (plus any number of additional "g" specifiers) represents the period or era, such as A.D. The formatting operation ignores this specifier if the date to be formatted doesn't have an associated period or era string.

If the "g" format specifier is used without other custom format specifiers, it's interpreted as the "g" standard date and time format specifier. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "h" custom format specifier represents the hour as a number from 1 to 12; that is, the hour is represented by a 12-hour clock that counts the whole hours since midnight or noon. A particular hour after midnight is indistinguishable from the same hour after noon. The hour is not rounded, and a single-digit hour is formatted without a leading zero. For example, given a time of 5:43 in the morning or afternoon, this custom format specifier displays "5".

If the "h" format specifier is used without other custom format specifiers, it's interpreted as a standard date and time format specifier and throws a FormatException. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "hh" custom format specifier (plus any number of additional "h" specifiers) represents the hour as a number from 01 to 12; that is, the hour is represented by a 12-hour clock that counts the whole hours since midnight or noon. A particular hour after midnight is indistinguishable from the same hour after noon. The hour is not rounded, and a single-digit hour is formatted with a leading zero. For example, given a time of 5:43 in the morning or afternoon, this format specifier displays "05".

The "H" custom format specifier represents the hour as a number from 0 to 23; that is, the hour is represented by a zero-based 24-hour clock that counts the hours since midnight. A single-digit hour is formatted without a leading zero.

If the "H" format specifier is used without other custom format specifiers, it's interpreted as a standard date and time format specifier and throws a FormatException. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "HH" custom format specifier (plus any number of additional "H" specifiers) represents the hour as a number from 00 to 23; that is, the hour is represented by a zero-based 24-hour clock that counts the hours since midnight. A single-digit hour is formatted with a leading zero.

The "K" custom format specifier represents the time zone information of a date and time value. When this format specifier is used with DateTime values, the result string is defined by the value of the DateTime.Kind property:

If the "K" format specifier is used without other custom format specifiers, it's interpreted as a standard date and time format specifier and throws a FormatException. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "m" custom format specifier represents the minute as a number from 0 to 59. The minute represents whole minutes that have passed since the last hour. A single-digit minute is formatted without a leading zero.

If the "m" format specifier is used without other custom format specifiers, it's interpreted as the "m" standard date and time format specifier. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "mm" custom format specifier (plus any number of additional "m" specifiers) represents the minute as a number from 00 to 59. The minute represents whole minutes that have passed since the last hour. A single-digit minute is formatted with a leading zero.

If the "M" format specifier is used without other custom format specifiers, it's interpreted as the "M" standard date and time format specifier. For more information about using a single format specifier, see Using Single Custom Format Specifiers later in this article.

The "MMM" custom format specifier represents the abbreviated name of the month. The localized abbreviated name of the month is retrieved from the DateTimeFormatInfo.AbbreviatedMonthNames property of the current or specified culture.

The "MMMM" custom format specifier represents the full name of the month. The localized name of the month is retrieved from the DateTimeFormatInfo.MonthNames property of the current or specified culture.

The "s" custom format specifier represents the seconds as a number from 0 to 59. The result represents whole seconds that have passed since the last minute. A single-digit second is formatted without a leading zero. ff782bc1db