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strptime(3) [freebsd man page]

STRPTIME(3)						   BSD Library Functions Manual 					       STRPTIME(3)

NAME
strptime -- parse date and time string LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <time.h> char * strptime(const char * restrict buf, const char * restrict format, struct tm * restrict timeptr); #include <time.h> #include <xlocale.h> char * strptime_l(const char * restrict buf, const char * restrict format, struct tm * restrict timeptr, locale_t loc); DESCRIPTION
The strptime() function parses the string in the buffer buf according to the string pointed to by format, and fills in the elements of the structure pointed to by timeptr. The resulting values will be relative to the local time zone. Thus, it can be considered the reverse oper- ation of strftime(3). The strptime_l() function does the same as strptime(), but takes an explicit locale rather than using the current locale. The format string consists of zero or more conversion specifications and ordinary characters. All ordinary characters are matched exactly with the buffer, where white space in the format string will match any amount of white space in the buffer. All conversion specifications are identical to those described in strftime(3). Two-digit year values, including formats %y and %D, are now interpreted as beginning at 1969 per POSIX requirements. Years 69-00 are inter- preted in the 20th century (1969-2000), years 01-68 in the 21st century (2001-2068). The %U and %W format specifiers accept any value within the range 00 to 53. If the format string does not contain enough conversion specifications to completely specify the resulting struct tm, the unspecified members of timeptr are left untouched. For example, if format is ``%H:%M:%S'', only tm_hour, tm_sec and tm_min will be modified. If time relative to today is desired, initialize the timeptr structure with today's date before passing it to strptime(). RETURN VALUES
Upon successful completion, strptime() returns the pointer to the first character in buf that has not been required to satisfy the specified conversions in format. It returns NULL if one of the conversions failed. strptime_l() returns the same values as strptime(). SEE ALSO
date(1), scanf(3), strftime(3) HISTORY
The strptime() function appeared in FreeBSD 3.0. AUTHORS
The strptime() function has been contributed by Powerdog Industries. This man page was written by Jorg Wunsch. BUGS
Both the %e and %l format specifiers may incorrectly scan one too many digits if the intended values comprise only a single digit and that digit is followed immediately by another digit. Both specifiers accept zero-padded values, even though they are both defined as taking unpadded values. The %p format specifier has no effect unless it is parsed after hour-related specifiers. Specifying %l without %p will produce undefined results. Note that 12AM (ante meridiem) is taken as midnight and 12PM (post meridiem) is taken as noon. The %Z format specifier only accepts time zone abbreviations of the local time zone, or the value "GMT". This limitation is because of ambi- guity due to of the over loading of time zone abbreviations. One such example is EST which is both Eastern Standard Time and Eastern Aus- tralia Summer Time. The strptime() function does not correctly handle multibyte characters in the format argument. BSD
October 2, 2014 BSD

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STRPTIME(3)						   BSD Library Functions Manual 					       STRPTIME(3)

NAME
strptime -- converts a character string to a time value LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <time.h> char * strptime(const char * restrict buf, const char * restrict format, struct tm * restrict tm); DESCRIPTION
The strptime() function converts the character string pointed to by buf to values which are stored in the tm structure pointed to by tm, using the format specified by format. The format string consists of zero or more conversion specifications, whitespace characters as defined by isspace(), and ordinary characters. All ordinary characters in format are compared directly against the corresponding characters in buf; comparisons which fail will cause strptime() to fail. Whitespace characters in format match any number of whitespace characters in buf, including none. A conversion specification consists of a percent sign '%' followed by one or two conversion characters which specify the replacement required. There must be white-space or other non-alphanumeric characters between any two conversion specifications. Conversion of alphanumeric strings (such as month and weekday names) is done without regard to case. Conversion specifications which cannot be matched will cause strptime() to fail. The LC_TIME category defines the locale values for the conversion specifications. The following conversion specifications are supported: %a the day of week, using the locale's weekday names; either the abbreviated or full name may be specified. %A the same as %a. %b the month, using the locale's month names; either the abbreviated or full name may be specified. %B the same as %b. %c the date and time, using the locale's date and time format. %C the century number [0,99]; leading zeros are permitted but not required. This conversion should be used in conjunction with the %y conversion. %d the day of month [1,31]; leading zeros are permitted but not required. %D the date as %m/%d/%y. %e the same as %d. %F the date as %Y-%m-%d (the ISO 8601 date format). %g the year corresponding to the ISO week number, without the century. (A NetBSD extension.) %G the year corresponding to the ISO week number, with the century. (A NetBSD extension.) %h the same as %b. %H the hour (24-hour clock) [0,23]; leading zeros are permitted but not required. %I the hour (12-hour clock) [1,12]; leading zeros are permitted but not required. %j the day number of the year [1,366]; leading zeros are permitted but not required. %k the same as %H. %l the same as %I. %m the month number [1,12]; leading zeros are permitted but not required. %M the minute [0,59]; leading zeros are permitted but not required. %n any white-space, including none. %p the locale's equivalent of a.m. or p.m. %r the time (12-hour clock) with %p, using the locale's time format. %R the time as %H:%M. %S the seconds [0,61]; leading zeros are permitted but not required. %s the number of seconds since the Epoch, UTC (see mktime(3)). (A NetBSD extension.) %t any white-space, including none. %T the time as %H:%M:%S. %u the day of the week as a decimal number, where Monday = 1. (A NetBSD extension.) %U the week number of the year (Sunday as the first day of the week) as a decimal number [0,53]; leading zeros are permitted but not required. All days in a year preceding the first Sunday are considered to be in week 0. %V the ISO 8601:1988 week number as a decimal number. If the week (starting on Monday) that contains January 1 has more than three days in the new year, then it is considered the first week of the year. If it has fewer than four days in the new year, then it is consid- ered the last week of the previous year. Weeks are numbered from 1 to 53. (A NetBSD extension.) %w the weekday as a decimal number [0,6], with 0 representing Sunday; leading zeros are permitted but not required. %W the week number of the year (Monday as the first day of the week) as a decimal number [0,53]; leading zeros are permitted but not required. All days in a year preceding the first Monday are considered to be in week 0. %x the date, using the locale's date format. %X the time, using the locale's time format. %y the year within the 20th century [69,99] or the 21st century [0,68]; leading zeros are permitted but not required. If specified in conjunction with %C, specifies the year [0,99] within that century. %Y the year, including the century (i.e., 1996). %z an ISO 8601 or RFC-2822 timezone specification. This is one of the following: the offset from Coordinated Universal Time ('UTC') spec- ified as: ``[+-]hhmm'', ``[+-]hh:mm'', or ``[+-]hh''; 'UTC' specified as: ``GMT'' ('Greenwich Mean Time'), ``UT'' ('Universal Time'), or ``Z'' ('Zulu Time'); a three character US timezone specified as: ``EDT'', ``EST'', ``CDT'', ``CST'', ``MDT'', ``MST'', ``PDT'', or ``PST'', with the first letter standing for 'Eastern' (``E''), 'Central' (``C''), 'Mountain' (``M'') or 'Pacific' (``P''), and the sec- ond letter standing for 'Daylight' (``D'' or summer) time or 'Standard' (``S'') time; a single letter military timezone specified as: ``A'' through ``I'' and ``K'' through ``Y''. (A NetBSD extension.) %Z timezone name or no characters when time zone information is unavailable. (A NetBSD extension.) %% matches a literal `%'. No argument is converted. Modified conversion specifications For compatibility, certain conversion specifications can be modified by the E and O modifier characters to indicate that an alternative for- mat or specification should be used rather than the one normally used by the unmodified conversion specification. As there are currently neither alternative formats nor specifications supported by the system, the behavior will be as if the unmodified conversion specification were used. Case is ignored when matching string items in buf, such as month and weekday names. RETURN VALUES
If successful, the strptime() function returns a pointer to the character following the last character parsed. Otherwise, a NULL pointer is returned. SEE ALSO
ctime(3), isspace(3), localtime(3), strftime(3), tm(3) STANDARDS
The strptime() function conforms to X/Open Portability Guide Issue 4 (``XPG4''). BUGS
The %Z format specifier only accepts timezone abbreviations of the local timezone, or the value ``GMT''. This limitation is caused by the ambiguity of overloaded timezone abbreviations, for example EST is both Eastern Standard Time and Eastern Australia Summer Time. BSD
April 12, 2011 BSD

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