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@node Timefns @chapter Time Functions (@file{time.h}) 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 @file{time.h} defines three types. @code{clock_t} and @code{time_t} are both used for representations of time particularly suitable for arithmetic. (In this implementation, quantities of type @code{clock_t} have the highest resolution possible on your machine, and quantities of type @code{time_t} resolve to seconds.) @code{size_t} is also defined if necessary for quantities representing sizes. @file{time.h} also defines the structure @code{tm} for the traditional representation of Gregorian calendar time as a series of numbers, with the following fields: @table @code @item tm_sec Seconds, between 0 and 60 inclusive (60 allows for leap seconds). @item tm_min Minutes, between 0 and 59 inclusive. @item tm_hour Hours, between 0 and 23 inclusive. @item tm_mday Day of the month, between 1 and 31 inclusive. @item tm_mon Month, between 0 (January) and 11 (December). @item tm_year Year (since 1900), can be negative for earlier years. @item tm_wday Day of week, between 0 (Sunday) and 6 (Saturday). @item tm_yday Number of days elapsed since last January 1, between 0 and 365 inclusive. @item 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. @end table @menu * asctime:: Format time as string * clock:: Cumulative processor time * ctime:: Convert time to local and format as string * difftime:: Subtract two times * gmtime:: Convert time to UTC (GMT) traditional representation * localtime:: Convert time to local representation * mktime:: Convert time to arithmetic representation * strftime:: Flexible calendar time formatter * time:: Get current calendar time (as single number) * __tz_lock:: Lock time zone global variables * tzset:: Set timezone info @end menu @page @include time/asctime.def @page @include time/clock.def @page @include time/ctime.def @page @include time/difftime.def @page @include time/gmtime.def @page @include time/lcltime.def @page @include time/mktime.def @page @include time/strftime.def @page @include time/time.def @page @include time/tzlock.def @page @include time/tzset.def
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