C examples for time.h:strftime
function
<ctime> <time.h>
size_t strftime (char* ptr, size_t maxsize, const char* format, const struct tm* timeptr );
Format time as string
| Parameter | Description |
|---|---|
| ptr | Pointer to resulting C string. |
| maxsize | Maximum number of characters to save to ptr, including the terminating null-character. |
| timeptr | Pointer to a tm structure. |
| format | format specifiers. They all begin with a percentage (%) sign, and are: |
| 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') | \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 |
| %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 (00-53) | 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 | % |
| 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 |
On success, it turns the resulting C string.
Otherwise, it returns zero.
#include <stdio.h> #include <time.h> int main ()/*from ww w . ja v a2s .c om*/ { time_t rawtime; struct tm * timeinfo; char buffer [80]; time (&rawtime); timeinfo = localtime (&rawtime); strftime (buffer,80,"Now it's %I:%M%p.",timeinfo); puts (buffer); return 0; }