Syntax:
#include <ctime> 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 (e.g. Fri) |
%A | full weekday name (e.g. Friday) |
%b | abbreviated month name (e.g. Oct) |
%B | full month name (e.g. October) |
%c | the standard date and time string |
%d | day of the month, as a number (1-31) |
%H | hour, 24 hour format (00-23) |
%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, (0-53), where week 1 has the first Sunday |
%w | weekday as a decimal (0-6), where Sunday is 0 |
%W | week of the year, (0-53), where week 1 has the first Monday |
%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.