1 /*-------------------------------------------------------------------------
4 * Definitions for the date/time and other date/time support code.
5 * The support code is shared with other date data types,
6 * including abstime, reltime, date, and time.
9 * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
10 * Portions Copyright (c) 1994, Regents of the University of California
12 * $Id: datetime.h,v 1.25 2001/10/28 06:26:09 momjian Exp $
14 *-------------------------------------------------------------------------
23 #include "utils/timestamp.h"
26 /* ----------------------------------------------------------------
27 * time types + support macros
29 * String definitions for standard time quantities.
31 * These strings are the defaults used to form output time strings.
32 * Other alternate forms are hardcoded into token tables in datetime.c.
33 * ----------------------------------------------------------------
37 #define DCURRENT "current"
39 #define INVALID "invalid"
40 #define EARLY "-infinity"
41 #define LATE "infinity"
44 #define TOMORROW "tomorrow"
45 #define YESTERDAY "yesterday"
48 #define DMICROSEC "usecond"
49 #define DMILLISEC "msecond"
50 #define DSECOND "second"
51 #define DMINUTE "minute"
55 #define DMONTH "month"
56 #define DQUARTER "quarter"
58 #define DDECADE "decade"
59 #define DCENTURY "century"
60 #define DMILLENNIUM "millennium"
63 #define DTIMEZONE "timezone"
66 * Fundamental time field definitions for parsing.
68 * Meridian: am, pm, or 24-hour style.
80 * Fields for time decoding.
82 * Can't have more of these than there are bits in an unsigned int
83 * since these are turned into bit masks during parsing and decoding.
85 * Furthermore, the values for YEAR, MONTH, DAY, HOUR, MINUTE, SECOND
86 * must be in the range 0..14 so that the associated bitmasks can fit
87 * into the left half of an INTERVAL's typmod value.
107 /* these are only for relative dates */
109 #define ABS_BEFORE 18
111 /* reserved for unrecognized string values */
112 #define UNKNOWN_FIELD 31
115 * Token field definitions for time parsing and decoding.
116 * These need to fit into the datetkn table type.
117 * At the moment, that means keep them within [-127,127].
118 * These are also used for bit masks in DecodeDateDelta()
119 * so actually restrict them to within [0,31] for now.
121 * Not all of these fields are used for masks in DecodeDateDelta
122 * so allow some larger than 31. - thomas 1997-11-17
133 #define DTK_SPECIAL 6
134 #define DTK_INVALID 7
135 #define DTK_CURRENT 8
140 #define DTK_YESTERDAY 13
142 #define DTK_TOMORROW 15
146 #define DTK_SECOND 18
147 #define DTK_MINUTE 19
152 #define DTK_QUARTER 24
154 #define DTK_DECADE 26
155 #define DTK_CENTURY 27
156 #define DTK_MILLENNIUM 28
157 #define DTK_MILLISEC 29
158 #define DTK_MICROSEC 30
159 #define DTK_JULIAN 31
163 #define DTK_TZ_HOUR 34
164 #define DTK_TZ_MINUTE 35
166 #define DTK_ISO_DATE 36
167 #define DTK_ISO_TIME 37
171 * Bit mask definitions for time parsing.
174 #define DTK_M(t) (0x01 << (t))
176 #define DTK_DATE_M (DTK_M(YEAR) | DTK_M(MONTH) | DTK_M(DAY))
177 #define DTK_TIME_M (DTK_M(HOUR) | DTK_M(MINUTE) | DTK_M(SECOND))
179 #define MAXDATELEN 51 /* maximum possible length of an input
180 * date string (not counting tr. null) */
181 #define MAXDATEFIELDS 25 /* maximum possible number of fields in a
183 #define TOKMAXLEN 10 /* only this many chars are stored in
186 /* keep this struct small; it gets used a lot */
192 char token[TOKMAXLEN];
195 char value; /* this may be unsigned, alas */
200 * Macro to replace modf(), which is broken on some platforms.
202 #define TMODULO(t,q,u) \
204 q = ((t < 0)? ceil(t / u): floor(t / u)); \
210 #define TIMEZONE_GLOBAL _timezone
212 #define TIMEZONE_GLOBAL timezone
216 * Date/time validation
217 * Include check for leap year.
220 extern int day_tab[2][13];
222 #define isleap(y) (((y) % 4) == 0 && (((y) % 100) != 0 || ((y) % 400) == 0))
224 /* Julian date support for date2j() and j2date()
225 * Set the minimum year to one greater than the year of the first valid day
226 * to avoid having to check year and day both. - tgl 97/05/08
229 #define JULIAN_MINYEAR (-4713)
230 #define JULIAN_MINMONTH (11)
231 #define JULIAN_MINDAY (23)
233 #define IS_VALID_JULIAN(y,m,d) (((y) > JULIAN_MINYEAR) \
234 || (((y) == JULIAN_MINYEAR) && (((m) > JULIAN_MINMONTH) \
235 || (((m) == JULIAN_MINMONTH) && ((d) >= JULIAN_MINDAY)))))
237 #define UTIME_MINYEAR (1901)
238 #define UTIME_MINMONTH (12)
239 #define UTIME_MINDAY (14)
240 #define UTIME_MAXYEAR (2038)
241 #define UTIME_MAXMONTH (01)
242 #define UTIME_MAXDAY (18)
244 #define IS_VALID_UTIME(y,m,d) ((((y) > UTIME_MINYEAR) \
245 || (((y) == UTIME_MINYEAR) && (((m) > UTIME_MINMONTH) \
246 || (((m) == UTIME_MINMONTH) && ((d) >= UTIME_MINDAY))))) \
247 && (((y) < UTIME_MAXYEAR) \
248 || (((y) == UTIME_MAXYEAR) && (((m) < UTIME_MAXMONTH) \
249 || (((m) == UTIME_MAXMONTH) && ((d) <= UTIME_MAXDAY))))))
252 extern void GetCurrentTime(struct tm * tm);
253 extern void GetCurrentTimeUsec(struct tm * tm, double *fsec);
254 extern void j2date(int jd, int *year, int *month, int *day);
255 extern int date2j(int year, int month, int day);
257 extern int ParseDateTime(char *timestr, char *lowstr,
258 char **field, int *ftype,
259 int maxfields, int *numfields);
260 extern int DecodeDateTime(char **field, int *ftype,
262 struct tm * tm, double *fsec, int *tzp);
264 extern int DecodeTimeOnly(char **field, int *ftype,
266 struct tm * tm, double *fsec, int *tzp);
268 extern int DecodeDateDelta(char **field, int *ftype,
270 struct tm * tm, double *fsec);
272 extern int DetermineLocalTimeZone(struct tm * tm);
274 extern int EncodeDateOnly(struct tm * tm, int style, char *str);
275 extern int EncodeTimeOnly(struct tm * tm, double fsec, int *tzp, int style, char *str);
276 extern int EncodeDateTime(struct tm * tm, double fsec, int *tzp, char **tzn, int style, char *str);
277 extern int EncodeTimeSpan(struct tm * tm, double fsec, int style, char *str);
279 extern int DecodeSpecial(int field, char *lowtoken, int *val);
280 extern int DecodeUnits(int field, char *lowtoken, int *val);
281 extern void ClearDateCache(bool);
283 extern int j2day(int jd);
285 #endif /* DATETIME_H */