Format
The date output connection can be custom modifyed.
| specifier | Replaced by | Example |
| %a | Abbreviated weekday name * | Thu |
| %A | Full weekday name * | Thursday |
| %b | Abbreviated month name * | Aug |
| %B | Full month name * | August |
| %c | Date and time representation * | Thu Aug 23 14:55:02 2001 |
| %C | Year divided by 100 and truncated to integer (00-99) | 20 |
| %d | Day of the month, zero-padded (01-31) | 23 |
| %D | Short MM/DD/YY date, equivalent to %m/%d/%y | 08/23/01 |
| %e | Day of the month, space-padded ( 1-31) | 23 |
| %F | Short YYYY-MM-DD date, equivalent to %Y-%m-%d | 2001-08-23 |
| %g | Week-based year, last two digits (00-99) | 01 |
| %G | Week-based year | 2001 |
| %h | Abbreviated month name * (same as %b) | Aug |
| %H | Hour in 24h format (00-23) | 14 |
| %I | Hour in 12h format (01-12) | 02 |
| %j | Day of the year (001-366) | 235 |
| %m | Month as a decimal number (01-12) | 08 |
| %M | Minute (00-59) | 55 |
| %n | New-line character (‘\n’) | |
| %p | AM or PM designation | PM |
| %r | 12-hour clock time * | 02:55:02 pm |
| %R | 24-hour HH:MM time, equivalent to %H:%M | 14:55 |
| %S | Second (00-61) | 02 |
| %t | Horizontal-tab character (‘\t’) | |
| %T | ISO 8601 time format (HH:MM:SS), equivalent to %H:%M:%S | 14:55:02 |
| %u | ISO 8601 weekday as number with Monday as 1 (1-7) | 4 |
| %U | Week number with the first Sunday as the first day of week one (00-53) | 33 |
| %V | ISO 8601 week number (01-53) | 34 |
| %w | Weekday as a decimal number with Sunday as 0 (0-6) | 4 |
| %W | Week number with the first Monday as the first day of week one (00-53) | 34 |
| %x | Date representation * | 08/23/01 |
| %X | Time representation * | 14:55:02 |
| %y | Year, last two digits (00-99) | 01 |
| %Y | Year | 2001 |
| %z | ISO 8601 offset from UTC in timezone (1 minute=1, 1 hour=100) If timezone cannot be determined, no characters |
+100 |
| %Z | Timezone name or abbreviation * If timezone cannot be determined, no characters |
CDT |
| %% | A % sign | % |
* The specifiers marked with an asterisk (*) are locale-dependent.
Note: Yellow rows indicate specifiers and sub-specifiers introduced by C99.
Since C99, two locale-specific modifiers can also be inserted between the percentage sign (%)
and the specifier proper to request an alternative format, where applicable:
| Modifier | Meaning | Applies to |
| E | Uses the locale’s alternative representation | %Ec %EC %Ex %EX %Ey %EY |
| O | Uses the locale’s alternative numeric symbols | %Od %Oe %OH %OI %Om %OM %OS %Ou %OU %OV %Ow %OW %Oy |