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parsedate(3) [netbsd man page]

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

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

Check Out this Related Man Page

CALENDAR(3)						   BSD Library Functions Manual 					       CALENDAR(3)

easterg, easterog, easteroj, gdate, jdate, ndaysg, ndaysj, week, weekday -- Calendar arithmetic for the Christian era LIBRARY
Calendar Arithmetic Library (libcalendar, -lcalendar) SYNOPSIS
#include <calendar.h> struct date * easterg(int year, struct date *dt); struct date * easterog(int year, struct date *dt); struct date * easteroj(int year, struct date *dt); struct date * gdate(int nd, struct date *dt); struct date * jdate(int nd, struct date *dt); int ndaysg(struct date *dt); int ndaysj(struct date *dt); int week(int nd, int *year); int weekday(int nd); DESCRIPTION
These functions provide calendar arithmetic for a large range of years, starting at March 1st, year zero (i.e., 1 B.C.) and ending way beyond year 100000. Programs should be linked with -lcalendar. The functions easterg(), easterog() and easteroj() store the date of Easter Sunday into the structure pointed at by dt and return a pointer to this structure. The function easterg() assumes Gregorian Calendar (adopted by most western churches after 1582) and the functions easterog() and easteroj() compute the date of Easter Sunday according to the orthodox rules (Western churches before 1582, Greek and Russian Orthodox Church until today). The result returned by easterog() is the date in Gregorian Calendar, whereas easteroj() returns the date in Julian Calendar. The functions gdate(), jdate(), ndaysg() and ndaysj() provide conversions between the common "year, month, day" notation of a date and the "number of days" representation, which is better suited for calculations. The days are numbered from March 1st year 1 B.C., starting with zero, so the number of a day gives the number of days since March 1st, year 1 B.C. The conversions work for nonnegative day numbers only. The gdate() and jdate() functions store the date corresponding to the day number nd into the structure pointed at by dt and return a pointer to this structure. The ndaysg() and ndaysj() functions return the day number of the date pointed at by dt. The gdate() and ndaysg() functions assume Gregorian Calendar after October 4, 1582 and Julian Calendar before, whereas jdate() and ndaysj() assume Julian Calendar throughout. The two calendars differ by the definition of the leap year. The Julian Calendar says every year that is a multiple of four is a leap year. The Gregorian Calendar excludes years that are multiples of 100 and not multiples of 400. This means the years 1700, 1800, 1900, 2100 are not leap years and the year 2000 is a leap year. The new rules were inaugurated on October 4, 1582 by deleting ten days following this date. Most catholic countries adopted the new calendar by the end of the 16th century, whereas others stayed with the Julian Calendar until the 20th century. The United Kingdom and their colonies switched on September 2, 1752. They already had to delete 11 days. The function week() returns the number of the week which contains the day numbered nd. The argument *year is set with the year that contains (the greater part of) the week. The weeks are numbered per year starting with week 1, which is the first week in a year that includes more than three days of the year. Weeks start on Monday. This function is defined for Gregorian Calendar only. The function weekday() returns the weekday (Mo = 0 .. Su = 6) of the day numbered nd. The structure date is defined in <calendar.h>. It contains these fields: int y; /* year (0000 - ????) */ int m; /* month (1 - 12) */ int d; /* day of month (1 - 31) */ The year zero is written as "1 B.C." by historians and "0" by astronomers and in this library. SEE ALSO
ncal(1), strftime(3) STANDARDS
The week number conforms to ISO 8601: 1988. HISTORY
The calendar library first appeared in FreeBSD 3.0. AUTHORS
This manual page and the library was written by Wolfgang Helbig <>. BUGS
The library was coded with great care so there are no bugs left. BSD
November 29, 1997 BSD

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