diplodocus.org Git - nmh/blob - h/tws.h

   1 /* tws.h -- time routines.
   2  */
   3
   4 /* A timezone given as a numeric-only offset will
   5    be treated specially if it's in a zone that observes Daylight Saving Time.
   6    For instance, during DST, a Date: like "Mon, 24 Jul 2000 12:31:44 -0700" will
   7    be printed as "Mon, 24 Jul 2000 12:31:44 PDT".  Without the code activated by
   8    the following #define, that would be incorrectly printed as "...MST". */
   9
  10 struct tws {
  11     int tw_sec;         /* seconds after the minute - [0, 61] */
  12     int tw_min;         /* minutes after the hour - [0, 59]   */
  13     int tw_hour;        /* hour since midnight - [0, 23]      */
  14     int tw_mday;        /* day of the month - [1, 31]         */
  15     int tw_mon;         /* months since January - [0, 11]     */
  16     int tw_year;        /* 4 digit year (e.g. 1997)           */
  17     int tw_wday;        /* days since Sunday - [0, 6]         */
  18     int tw_yday;        /* days since January 1 - [0, 365]    */
  19     int tw_zone;
  20     time_t tw_clock;    /* if != 0, corresponding calendar value */
  21     int tw_flags;
  22 };
  23
  24 #define TW_NULL  0x0000
  25
  26 #define TW_SDAY  0x0003 /* how day-of-week was determined */
  27 #define TW_SEXP  0x0001 /*   explicitly given             */
  28 #define TW_SIMP  0x0002 /*   implicitly given             */
  29
  30 #define TW_SZEXP 0x0004 /* Explicit timezone. */
  31
  32 #define TW_DST   0x0010 /* daylight savings time          */
  33 #define TW_ZONE  0x0020 /* use numeric timezones only     */
  34
  35 #define TW_SUCC  0x0040 /* Parsing was successful. */
  36
  37 #define dtwszone(tw) dtimezone (tw->tw_zone, tw->tw_flags)
  38
  39 /*
  40  * prototypes
  41  */
  42 struct tws *dparsetime (char *);