| %A | is replaced by national representation of the full weekday name. |
| %a | is replaced by national representation of the abbreviated weekday name. |
| %B | is replaced by national representation of the full month name. |
| %b | is replaced by national representation of the abbreviated month name. |
| %C | is replaced by (year / 100) as decimal number; single digits are preceded by a zero. |
| %c | is replaced by national representation of time and date. |
| %D | is equivalent to "%m/%d/%y". |
| %d | is replaced by the day of the month as a decimal number (01-31). |
| %E* %O* |
| | POSIX locale extensions. The sequences %Ec %EC %Ex %EX %Ey %EY %Od %Oe %OH %OI %Om %OM %OS %Ou %OU %OV %Ow %OW %Oy are supposed to provide alternate representations. Additionally %OB implemented to represent alternative months names (used standalone, without day mentioned). |
| %e | is replaced by the day of month as a decimal number (1-31); single digits are preceded by a blank. |
| %F | is equivalent to "%Y-%m-%d". |
| %G | is replaced by a year as a decimal number with century. This year is the one that contains the greater part of the week (Monday as the first day of the week). |
| %g | is replaced by the same year as in "%G", but as a decimal number without century (00-99). |
| %H | is replaced by the hour (24-hour clock) as a decimal number (00-23). |
| %h | the same as %b. |
| %I | is replaced by the hour (12-hour clock) as a decimal number (01-12). |
| %j | is replaced by the day of the year as a decimal number (001-366). |
| %k | is replaced by the hour (24-hour clock) as a decimal number (0-23); single digits are preceded by a blank. |
| %l | is replaced by the hour (12-hour clock) as a decimal number (1-12); single digits are preceded by a blank. |
| %M | is replaced by the minute as a decimal number (00-59). |
| %m | is replaced by the month as a decimal number (01-12). |
| %n | is replaced by a newline. |
| %O* | the same as %E*. |
| %p | is replaced by national representation of either "ante meridiem" or "post meridiem" as appropriate. |
| %R | is equivalent to "%H:%M". |
| %r | is equivalent to "%I:%M:%S %p". |
| %S | is replaced by the second as a decimal number (00-60). |
| %s | is replaced by the number of seconds since the Epoch, UTC (see mktime(3)). |
| %T | is equivalent to "%H:%M:%S". |
| %t | is replaced by a tab. |
| %U | is replaced by the week number of the year (Sunday as the first day of the week) as a decimal number (00-53). |
| %u | is replaced by the weekday (Monday as the first day of the week) as a decimal number (1-7). |
| %V | is replaced by the week number of the year (Monday as the first day of the week) as a decimal number (01-53). If the week containing January 1 has four or more days in the new year, then it is week 1; otherwise it is the last week of the previous year, and the next week is week 1. |
| %v | is equivalent to "%e-%b-%Y". |
| %W | is replaced by the week number of the year (Monday as the first day of the week) as a decimal number (00-53). |
| %w | is replaced by the weekday (Sunday as the first day of the week) as a decimal number (0-6). |
| %X | is replaced by national representation of the time. |
| %x | is replaced by national representation of the date. |
| %Y | is replaced by the year with century as a decimal number. |
| %y | is replaced by the year without century as a decimal number (00-99). |
| %Z | is replaced by the time zone name. |
| %z | is replaced by the time zone offset from UTC; a leading plus sign stands for east of UTC, a minus sign for west of UTC, hours and minutes follow with two digits each and no delimiter between them (common form for RFC 822 date headers). |
| %+ | is replaced by national representation of the date and time (the format is similar to that produced by date(1)). |
| %-* | GNU libc extension. Do not do any padding when performing numerical outputs. |
| %_* | GNU libc extension. Explicitly specify space for padding. |
| %0* | GNU libc extension. Explicitly specify zero for padding. |
| %% | is replaced by ‘%’. |
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