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postgres/contrib/datetime/datetime_functions.doc

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I have written some new funtions for time and date data types which can
be used to extract hour,minutes,seconds from time values, and year,
month,day from a date. There is also a time_difference and functions
to convert a time to minutes or seconds.
There are also new input/output functions for the time data type which
allow the insertion of time attributes with value 24:00:00.
This can be useful if your application needs to compute time difference
from two time values representing an elapsed time of 24 hours.
Massimo Dal Zotto <dz@cs.unitn.it>