The C <time.h> header defines several functions, types and macros to get and manipulate date and time information. These types and macros are available to use in a current program after including the header file using - #include <time.h>. All types and macros of this header file are listed below:
| Functions | Description |
|---|
| clock() |
Returns raw processor clock time since the program is started. |
| difftime() |
Returns difference between two times. |
| mktime() |
Converts tm structure to time_t. |
| time() |
Returns the current time. |
| Functions | Description |
|---|
| asctime() |
Converts tm structure to a textual representation. |
| ctime() |
Convert time_t value to a textual representation. |
| gmtime() |
Convert time_t value into calendar time, expressed in UTC time. |
| localtime() |
Convert time_t value into calendar time, expressed in local time. |
| strftime() |
Formats time as string. |
| Types | Description |
|---|
| clock_t |
Process running time. |
| size_t |
Unsigned integer type. |
| time_t |
Time type. |
| tm |
Time structure. |
| Macros | Description |
|---|
| CLOCKS_PER_SEC |
Number of processor clock ticks per second. |
| NULL |
Null pointer. |
