Calendar Time
=============
This section describes facilities for keeping track of calendar time.
Note:Time Basics.
The GNU C library represents calendar time three ways:
* "Simple time" (the `time_t' data type) is a compact
representation, typically giving the number of seconds of elapsed
time since some implementation-specific base time.
* There is also a "high-resolution time" representation. Like simple
time, this represents a calendar time as an elapsed time since a
base time, but instead of measuring in whole seconds, it uses a
`struct timeval' data type, which includes fractions of a second.
Use this time representation instead of simple time when you need
greater precision.
* "Local time" or "broken-down time" (the `struct tm' data type)
represents a calendar time as a set of components specifying the
year, month, and so on in the Gregorian calendar, for a specific
time zone. This calendar time representation is usually used only
to communicate with people.