The format string consists from whitespace characters, non-whitespace characters (except %) and conversion specifications. Each conversion specification begins with % character and contains a conversion format specifier. The following format specifiers are available:
Conversion
specifier
|
Explanation
|
Used fields
|
| %
|
writes literal %. The full conversion specification must be %%.
|
|
| n
|
writes newline character
|
|
| t
|
writes horizontal tab character
|
|
| Year
|
|---|
| Y
|
writes year as a 4 digit decimal number
|
tm_year
|
| y
|
writes last 2 digits of year as a decimal number (range [00,99])
|
tm_year
|
| G
|
writes ISO 8601 week-based year, i.e. the year that contains the specified week.
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
|
tm_year, tm_wday, tm_yday
|
| g
|
writes last 2 digits of ISO 8601 week-based year, i.e. the year that contains the specified week (range [00,99]).
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
|
tm_year, tm_wday, tm_yday
|
| Month
|
|---|
| b
|
writes abbreviated month name, e.g. Oct (locale dependent)
|
tm_mon
|
| B
|
writes full month name, e.g. October (locale dependent)
|
tm_mon
|
| m
|
writes month as a decimal number (range [01,12])
|
tm_mon
|
| Week
|
|---|
| U
|
writes week of the year as a decimal number (Sunday is the first day of the week) (range [00,60])
|
tm_year, tm_wday, tm_yday
|
| W
|
writes week of the year as a decimal number (Monday is the first day of the week) (range [00,60])
|
tm_year, tm_wday, tm_yday
|
| V
|
writes ISO 8601 week of the year (range [01,53]).
In IS0 8601 weeks begin with Monday and the first week of the year must satisfy the following requirements:
- Includes January 4
- Includes first Thursday of the year
|
tm_year, tm_wday, tm_yday
|
| Day of the year/month
|
|---|
| j
|
writes day of the year as a decimal number (range [001,366])
|
tm_yday
|
| d
|
writes day of the month as a decimal number (range [01,31])
|
tm_mday
|
| h
|
equivalent to "%d"
|
tm_mday
|
| e
|
writes day of the month as a decimal number (range [1,31]).
Single digit is preceded by a space.
|
tm_mday
|
| j
|
writes day of the year as a decimal number (range [001,366])
|
tm_yday
|
| Day of the week
|
|---|
| a
|
writes abbreviated weekday name, e.g. Fri (locale dependent)
|
tm_wday
|
| A
|
writes full weekday name, e.g. Friday (locale dependent)
|
tm_wday
|
| u
|
writes weekday as a decimal number, where Monday is 1 (ISO 8601 format) (range [1-7])
|
tm_wday
|
| w
|
writes weekday as a decimal number, where Sunday is 0 (range [0-6])
|
tm_wday
|
| Hour, minute, second
|
|---|
| H
|
writes hour as a decimal number, 24 hour clock (range [00-23])
|
tm_hour
|
| I
|
writes hour as a decimal number, 12 hour clock (range [01,12])
|
tm_hour
|
| M
|
writes minute as a decimal number (range [00,59])
|
tm_min
|
| S
|
writes second as a decimal number (range [00,60])
|
tm_sec
|
| Other
|
|---|
| c
|
writes standard date and time string, e.g. Sun Oct 17 04:41:13 2010 (locale dependent)
|
all
|
| x
|
writes localized date representation (locale dependent)
|
all
|
| X
|
writes localized time representation (locale dependent)
|
all
|
| D
|
equivalent to "%m/%d/%y"
|
tm_mon, tm_mday, tm_year
|
| F
|
equivalent to "%Y-%m-%d" (the ISO 8601 date format)
|
tm_mon, tm_mday, tm_year
|
| r
|
writes localized 12-hour clock time (locale dependent)
|
tm_hour, tm_min, tm_sec
|
| R
|
equivalent to "%H:%M"
|
tm_hour, tm_min
|
| T
|
equivalent to "%H:%M:%S" (the ISO 8601 time format)
|
tm_hour, tm_min, tm_sec
|
| p
|
writes localized a.m. or p.m. (locale dependent)
|
tm_hour
|
| z
|
writes offset from UTC in the ISO 8601 format (e.g. -0430), or no characters if the time zone information is not available
|
tm_isdst
|
| Z
|
writes time zone name or abbreviation, or no characters if the time zone information is not available (locale dependent)
|
tm_isdst
|