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These functions are concerned with dates and times.  The following functions
are defined:

_asctime
    makes time string from time structure

asctime
    makes time string from time structure

clock
    gets time since program start

_ctime
    gets calendar time string

ctime
    gets calendar time string

difftime
    calculate difference between two times

ftime
    returns the current time in a timeb structure

_gmtime
    convert calendar time to Coordinated Universal Time (UTC)

gmtime
    convert calendar time to Coordinated Universal Time (UTC)

_localtime
    convert calendar time to local time

localtime
    convert calendar time to local time

mktime
    make calendar time from local time

strftime
    format date and time

time
    get current calendar time

tzset
    set global variables to reflect the local time zone