Help with date in bash script for loop from YYYYMMDDHHMM Post: 303036345

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LEARN ABOUT NETBSD

parsedate

PARSEDATE(3)						   BSD Library Functions Manual 					      PARSEDATE(3)

NAME

     parsedate -- date parsing function

LIBRARY

     System Utilities Library (libutil, -lutil)

SYNOPSIS

     #include <util.h>

     time_t
     parsedate(const char *datestr, const time_t *time, const int *tzoff);

DESCRIPTION

     The parsedate() function parses a datetime from datestr described in english relative to an optional time point and an optional timezone off-
     set in seconds specified in tzoff.  If either time or tzoff are NULL, then the current time and timezone offset are used.

     The datestr is a sequence of white-space separated items.	The white-space is optional the concatenated items are not ambiguous.  An empty
     datestr is equivalent to midnight today (the beginning of this day).

     The following words have the indicated numeric meanings: last = -1, this = 0, first, next, or one = 1, second is unused so that it is not
     confused with ``seconds'', two = 2, third or three = 3, fourth or four = 4, fifth or five = 5, sixth or six = 6, seventh or seven = 7, eighth
     or eight = 8, ninth or nine = 9, tenth or ten = 10, eleventh or eleven = 11, twelfth or twoelve = 12.

     The following words are recognized in English only: AM, PM, a.m., p.m.

     The months: january, february, march, april, may, june, july, august, september, sept, october, november, december,

     The days of the week: sunday, monday, tuesday, tues, wednesday, wednes, thursday, thur, thurs, friday, saturday.

     Time units: year, month, fortnight, week, day, hour, minute, min, second, sec, tomorrow, yesterday.

     Timezone names: gmt, ut, utc, wet, bst, wat, at, ast, adt, est, edt, cst, cdt, mst, mdt, pst, pdt, yst, ydt, hst, hdt, cat, ahst, nt, idlw,
     cet, met, mewt, mest, swt, sst, fwt, fst, eet, bt, zp4, zp5, zp6, wast, wadt, cct, jst, east, eadt, gst, nzt, nzst, nzdt, idle.

     A variety of unambiguous dates are recognized:
     69-09-10	  For years between 69-99 we assume 1900+ and for years between 0-68 we assume 2000+.
     2006-11-17   An ISO-8601 date.
     10/1/2000	  October 10, 2000; the common US format.
     20 Jun 1994
     23jun2001
     1-sep-06	  Other common abbreviations.
     1/11	  the year can be omitted

     As well as times:
     10:01
     10:12pm
     12:11:01.000012
     12:21-0500

     Relative items are also supported:
     -1 month
     last friday
     one week ago
     this thursday
     next sunday
     +2 years

     Seconds since epoch (also known as UNIX time) are also supported:
     @735275209  Tue Apr 20 03:06:49 UTC 1993

RETURN VALUES

     parsedate() returns the number of seconds passed since the Epoch, or -1 if the date could not be parsed properly.

SEE ALSO

     date(1), eeprom(8)

HISTORY

     The parser used in parsedate() was originally written by Steven M. Bellovin while at the University of North Carolina at Chapel Hill.  It was
     later tweaked by a couple of people on Usenet.  Completely overhauled by Rich $alz and Jim Berets in August, 1990.

     The parsedate() function first appeared in NetBSD 4.0.

BUGS

     1
       The parsedate() function is not re-entrant or thread-safe.
     2
       The parsedate() function cannot compute days before the unix epoch (19700101).
     3
       The parsedate() function assumes years less than 0 mean - year, years less than 70 mean 2000 + year, years less than 100 mean 1900 + year.

BSD
								 December 20, 2010							       BSD

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