#include <time.h> size_t strftime( char *str, size_t maxsize, const char *fmt, struct tm *time );
The function strftime() formats date and time information from time to a format specified by fmt, then stores the result in str (up to maxsize characters). Certain codes may be used in fmt to specify different types of time:
| Code | Meaning |
|---|---|
| %a | abbreviated weekday name |
| %A | full weekday name |
| %b | abbreviated month name |
| %B | full month name |
| %c | the standard date and time string |
| %d | day of the month, as a number (1-31) |
| %H | hour, 24 hour format (0-23) |
| %I | hour, 12 hour format (1-12) |
| %j | day of the year, as a number (1-366) |
| %m | month as a number (1-12). Note: some versions of Microsoft Visual C++ may use values that range from 0-11. |
| %M | minute as a number (0-59) |
| %p | locale's equivalent of AM or PM |
| %S | second as a number (0-59) |
| %U | week of the year, sunday as the first day |
| %w | weekday as a decimal (0-6, sunday=0) |
| %W | week of the year, monday as the first day |
| %x | standard date string |
| %X | standard time string |
| %y | year in decimal, without the century (0-99) |
| %Y | year in decimal, with the century |
| %Z | time zone name |
| %% | a percent sign |
The strftime() function returns the number of characters put into str, or zero if an error occurs.