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This section describes facilities for keeping track of dates and times according to the Gregorian calendar.
There are three representations for date and time information:
time_t
data type) is a compact
representation, typically giving the number of seconds elapsed since
some implementation-specific base time.
struct
timeval
data type) that includes fractions of a second. Use this time
representation instead of ordinary calendar time when you need greater
precision.
struct
tm
data type) represents the date and time as a set of components
specifying the year, month, and so on, for a specific time zone.
This time representation is usually used in conjunction with formatting
date and time values.
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