Time Functions

This chapter groups functions used either for reporting on time (elapsed, current, or compute time) or to perform calculations based on time.

The header file ‘time.h’ defines three types. clock_t and time_t are both used for representations of time particularly suitable for arithmetic. (In this implementation, quantities of type clock_t have the highest resolution possible on your machine, and quantities of type time_t resolve to seconds.) size_t is also defined if necessary for quantities representing sizes. `time.h’ also defines the structure tm for the traditional representation of Gregorian calendar time as a series of numbers, with the following fields: tm_sec Seconds. tm_min Minutes. tm_hour Hours. tm_mday Day. tm_mon Month. tm_year Year (since 1900). tm_wday Day of week: the number of days since Sunday. tm_yday Number of days elapsed since last January 1. tm_isdst Daylight Savings Time flag: positive means DST in effect, zero means DST not in effect, negative means no information about DST is available.

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Authoritative source: BUSMASTER DITA help source time.dita, compiled into BUSMASTER.CHM with the application.