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Add 'day' field to INTERVAL so 1 day interval can be distinguished from

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24 hours. This is very helpful for daylight savings time:

	select '2005-05-03 00:00:00 EST'::timestamp with time zone + '24 hours';
	      ?column?
	----------------------
	2005-05-04 01:00:00-04

	select '2005-05-03 00:00:00 EST'::timestamp with time zone + '1 day';
	      ?column?
	----------------------
	2005-05-04 01:00:00-04

Michael Glaesemann
This commit is contained in:
Bruce Momjian
2005-07-20 16:42:32 +00:00
parent 826604f9e6
commit db05f4a7eb
12 changed files with 286 additions and 181 deletions
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30
src/include/utils/timestamp.h
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@@ -6,7 +6,7 @@
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.46 2005/06/29 22:51:57 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.47 2005/07/20 16:42:32 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -25,9 +25,9 @@
/*
* Timestamp represents absolute time.
* Interval represents delta time. Keep track of months (and years)
* separately since the elapsed time spanned is unknown until instantiated
* relative to an absolute time.
* Interval represents delta time. Keep track of months (and years), days,
* and time separately since the elapsed time spanned is unknown until
* instantiated relative to an absolute time.
*
* Note that Postgres uses "time interval" to mean a bounded interval,
* consisting of a beginning and ending time, not a time span - thomas 97/03/20
@@ -45,12 +45,13 @@ typedef double TimestampTz;
typedef struct
{
#ifdef HAVE_INT64_TIMESTAMP
int64 time; /* all time units other than months and
* years */
int64 time; /* all time units other than days,
* months and years */
#else
double time; /* all time units other than months and
* years */
double time; /* all time units other than days,
* months and years */
#endif
int32 day; /* days, after time for alignment */
int32 month; /* months and years, after time for
* alignment */
} Interval;
@@ -60,6 +61,7 @@ typedef struct
#define MAX_INTERVAL_PRECISION 6
#define SECS_PER_DAY 86400
#define SECS_PER_HOUR 3600
#ifdef HAVE_INT64_TIMESTAMP
#define USECS_PER_DAY INT64CONST(86400000000)
#define USECS_PER_HOUR INT64CONST(3600000000)
@@ -212,6 +214,8 @@ extern Datum interval_cmp(PG_FUNCTION_ARGS);
extern Datum interval_hash(PG_FUNCTION_ARGS);
extern Datum interval_smaller(PG_FUNCTION_ARGS);
extern Datum interval_larger(PG_FUNCTION_ARGS);
extern Datum interval_justify_hours(PG_FUNCTION_ARGS);
extern Datum interval_justify_days(PG_FUNCTION_ARGS);
extern Datum timestamp_text(PG_FUNCTION_ARGS);
extern Datum text_timestamp(PG_FUNCTION_ARGS);
@@ -266,16 +270,16 @@ extern Datum pgsql_postmaster_start_time(PG_FUNCTION_ARGS);
extern TimestampTz GetCurrentTimestamp(void);
extern int tm2timestamp(struct pg_tm * tm, fsec_t fsec, int *tzp, Timestamp *dt);
extern int timestamp2tm(Timestamp dt, int *tzp, struct pg_tm * tm,
extern int tm2timestamp(struct pg_tm *tm, fsec_t fsec, int *tzp, Timestamp *dt);
extern int timestamp2tm(Timestamp dt, int *tzp, struct pg_tm *tm,
fsec_t *fsec, char **tzn, pg_tz *attimezone);
extern void dt2time(Timestamp dt, int *hour, int *min, int *sec, fsec_t *fsec);
extern int interval2tm(Interval span, struct pg_tm * tm, fsec_t *fsec);
extern int tm2interval(struct pg_tm * tm, fsec_t fsec, Interval *span);
extern int interval2tm(Interval span, struct pg_tm *tm, fsec_t *fsec);
extern int tm2interval(struct pg_tm *tm, fsec_t fsec, Interval *span);
extern Timestamp SetEpochTimestamp(void);
extern void GetEpochTime(struct pg_tm * tm);
extern void GetEpochTime(struct pg_tm *tm);
extern int timestamp_cmp_internal(Timestamp dt1, Timestamp dt2);