Time Manipulation
| clock | Clock program (function ) |
| difftime | return difference between two times (function ) |
| mktime | Convert tm structure to time_t (function ) |
| time | Get current time (function ) |
Conversion
| asctime | Convert tm structure to string (function ) |
| ctime | Convert time_t value to string (function ) |
| gmtime | Convert time_t to tm as UTC time (function ) |
| localtime | Convert time_t to tm as local time (function ) |
| strftime | Format time as string (function ) |
Macro Constants
| CLOCKS_PER_SEC | Clock ticks per second (macro ) |
| NULL | Null pointer (macro ) |
Types
| clock_t | Clock type (type ) |
| size_t | Unsigned integral type (type ) |
| time_t | Time type (type ) |
| struct tm | Time structure (type ) |