1 /*-------------------------------------------------------------------------
4 * PostgreSQL internal timezone library
6 * Portions Copyright (c) 1996-2015, PostgreSQL Global Development Group
11 *-------------------------------------------------------------------------
18 * The API of this library is generally similar to the corresponding
19 * C library functions, except that we use pg_time_t which (we hope) is
20 * 64 bits wide, and which is most definitely signed not unsigned.
23 typedef int64 pg_time_t;
31 int tm_mon; /* origin 0, not 1 */
32 int tm_year; /* relative to 1900 */
40 typedef struct pg_tz pg_tz;
41 typedef struct pg_tzenum pg_tzenum;
43 /* Maximum length of a timezone name (not including trailing null) */
44 #define TZ_STRLEN_MAX 255
46 /* these functions are in localtime.c */
48 extern struct pg_tm *pg_localtime(const pg_time_t *timep, const pg_tz *tz);
49 extern struct pg_tm *pg_gmtime(const pg_time_t *timep);
50 extern int pg_next_dst_boundary(const pg_time_t *timep,
51 long int *before_gmtoff,
54 long int *after_gmtoff,
57 extern bool pg_interpret_timezone_abbrev(const char *abbrev,
58 const pg_time_t *timep,
62 extern bool pg_get_timezone_offset(const pg_tz *tz, long int *gmtoff);
63 extern const char *pg_get_timezone_name(pg_tz *tz);
64 extern bool pg_tz_acceptable(pg_tz *tz);
66 /* these functions are in strftime.c */
68 extern size_t pg_strftime(char *s, size_t max, const char *format,
69 const struct pg_tm * tm);
71 /* these functions and variables are in pgtz.c */
73 extern pg_tz *session_timezone;
74 extern pg_tz *log_timezone;
76 extern void pg_timezone_initialize(void);
77 extern pg_tz *pg_tzset(const char *tzname);
78 extern pg_tz *pg_tzset_offset(long gmtoffset);
80 extern pg_tzenum *pg_tzenumerate_start(void);
81 extern pg_tz *pg_tzenumerate_next(pg_tzenum *dir);
82 extern void pg_tzenumerate_end(pg_tzenum *dir);
84 #endif /* _PGTIME_H */