Standard C Date & Time

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asctime a textual version of the time
clock returns the amount of time that the program has been running
ctime returns a specifically formatted version of the time
difftime the difference between two times
gmtime returns a pointer to the current Greenwich Mean Time
localtime returns a pointer to the current time
mktime returns the calendar version of a given time
setlocale sets the current locale
strftime returns individual elements of the date and time
time returns the current calendar time of the system