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| 25. 11. 1. strftime |
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| Item | Value | | Header file | time.h | | Declaration | size_t strftime(char *str, size_t maxsize, const char *fmt, const struct tm *time); | | Function | format time and date into a string |
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- The strftime() function works a little like sprintf().
- The strftime() function returns the number of characters stored in the string pointed to by str or zero if an error occurs.
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| Command | Replaced By | | %a | Abbreviated weekday name | | %A | Full weekday name | | %b | Abbreviated month name | | %B | Full month name | | %c | Standard date and time string | | %C | Last two digits of year | | %d | Day of month as a decimal (1-31) | | %D | month/day/year (added by C99) | | %e | Day of month as a decimal (1-31) in a two-character field (added by C99) | | %F | year-month-day (added by C99) | | %g | Last two digits of year using a week-based year (added by C99) | | %G | The year using a week-based year (added by C99) | | %h | Abbreviated month name (added by C99) | | %H | Hour (0-23) | | %I | Hour (1-12) | | %j | Day of year as a decimal (1-366) | | %m | Month as decimal (1-12) | | %M | Minute as decimal (0-59) | | %n | A newline (added by C99) | | %p | Locale's equivalent of AM or PM | | %r | 12-hour time (added by C99) | | %R | hh:mm (added by C99) | | %S | Second as decimal (0-60) | | %t | Horizontal tab (added by C99) | | %T | hh:mm:ss (added by C99) | | %u | Day of week; Monday is first day of week (0-53) (added by C99) | | %U | Week of year, Sunday being first day (0-53) | | %V | Week of year using a week-based year (added by C99) | | %w | Weekday as a decimal (0-6, Sunday being 0) | | %W | Week of year, Monday being first day (0-53) | | %x | Standard date string | | %X | Standard time string | | %y | Year in decimal without century (0-99) | | %Y | Year including century as decimal | | %z | Offset from UTC (added by C99) | | %Z | Time zone name | | %% | The percent sign |
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- The E can modify c, C, x, X, y, Y, d, e, and H.
- The O can modify I, m, M, S, u, U, V, w, W, and y.
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A week-based year is used by the %g, %G, and %V format commands. |
With this representation, Monday is the first day of the week, and the first week of a year must include January 4. |
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#include <time.h>
#include <stdio.h>
int main(void)
{
struct tm *ptr;
time_t lt;
char str[80];
lt = time(NULL);
ptr = localtime(<);
strftime(str, 100, "It is now %H %p.", ptr);
printf(str);
return 0;
}
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It is now 16 PM. |
| 25. 11. strftime | | 25. 11. 1. | strftime | | |
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