| a | The abbreviated weekday name according to the current locale. |
| A | The full weekday name according to the current locale. |
| b | The abbreviated month name according to the current locale. |
| B | The full month name according to the current locale. |
| c | The preferred date and time representation for the current locale. |
| C | The century number (year/100) as a 2-digit integer. (SU) |
| d | The day of the month as a decimal number (range 01 to 31). |
| D | Equivalent to m/d/y. |
| e | Like d, the day of the month as a decimal number, but a leading zero is replaced by a space. (SU) |
| F | Equivalent to Y-m-d (the ISO 8601 date format). (C99) |
| h | Equivalent to b. |
| H | The hour as a decimal number using a 24-hour clock (range 00 to 23). |
| I | The hour as a decimal number using a 12-hour clock (range 01 to 12). |
| j | The day of the year as a decimal number (range 001 to 366). |
| k | The hour (24-hour clock) as a decimal number (range 0 to 23); single digits are preceded by a blank. See also H. |
| l | The hour (12-hour clock) as a decimal number (range 1 to 12); single digits are preceded by a blank. See also I. |
| m | The month as a decimal number (range 01 to 12). |
| M | The minute as a decimal number (range 00 to 59). |
| n | A newline character. (SU) |
| p | Either AM or PM according to the given time value, or the corresponding strings for the current locale. Noon is treated as pm and midnight as am. |
| r | The time in a.m. or p.m. notation. In the POSIX locale this is equivalent to I:M:S p. |
| s | The number of seconds since the Epoch, i.e., since 1970-01-01 00:00:00 UTC. |
| S | The second as a decimal number (range 00 to 60). (The range is up to 60 to allow for occasional leap seconds.) |
| t | A tab character. |
| T | The time in 24-hour notation (H:M:S). (SU) |
| u | The day of the week as a decimal, range 1 to 7, Monday being 1. See also w. |
| V | The ISO 8601:1988 week number of the current year as a decimal number, range 01 to 53, where week 1 is the first week that has at least 4 days in the current year, and with Monday as the first day of the week. See also U and W. |
| w | The day of the week as a decimal, range 0 to 6, Sunday being 0. |
| W | The week number of the current year as a decimal number, range 00 to 53, starting with the first Monday as the first day of week 01. |
| y | The year as a decimal number without a century (range 00 to 99). |
| Y | The year as a decimal number including the century. |
| z | The time-zone as hour offset from GMT. Required to emit RFC822-compliant dates (using a, d b Y H:M:S z). |
| Z | The time zone or name or abbreviation (not implemented yet). |
