Update date/time comments.
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@ -6,7 +6,7 @@
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.52 2005/07/21 20:37:21 momjian Exp $
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* $PostgreSQL: pgsql/src/include/utils/timestamp.h,v 1.53 2005/07/22 05:08:26 momjian Exp $
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*
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*
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*-------------------------------------------------------------------------
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*-------------------------------------------------------------------------
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*/
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*/
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@ -67,14 +67,16 @@ typedef struct
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* DAYS_PER_MONTH is very imprecise. The more accurate value is
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* DAYS_PER_MONTH is very imprecise. The more accurate value is
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* 365.2425/12 = 30.436875, or '30 days 10:29:06'. Right now we only
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* 365.2425/12 = 30.436875, or '30 days 10:29:06'. Right now we only
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* return an integral number of days, but someday perhaps we should
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* return an integral number of days, but someday perhaps we should
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* also return a 'time' value to be used as well.
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* also return a 'time' value to be used as well. ISO 8601 suggests
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* 30 days.
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*/
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*/
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#define DAYS_PER_MONTH 30 /* assumes exactly 30 days per month */
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#define DAYS_PER_MONTH 30 /* assumes exactly 30 days per month */
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#define HOURS_PER_DAY 24 /* assume no daylight savings time changes */
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#define HOURS_PER_DAY 24 /* assume no daylight savings time changes */
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/*
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/*
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* This doesn't adjust for uneven daylight savings time intervals or leap
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* This doesn't adjust for uneven daylight savings time intervals or leap
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* seconds, and it crudely estimates leap years.
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* seconds, and it crudely estimates leap years. A more accurate value
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* for days per years is 365.2422.
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*/
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*/
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#define SECS_PER_YEAR (36525 * 864) /* avoid floating-point computation */
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#define SECS_PER_YEAR (36525 * 864) /* avoid floating-point computation */
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#define SECS_PER_DAY 86400
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#define SECS_PER_DAY 86400
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@ -223,14 +223,16 @@ do { \
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* DAYS_PER_MONTH is very imprecise. The more accurate value is
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* DAYS_PER_MONTH is very imprecise. The more accurate value is
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* 365.2425/12 = 30.436875, or '30 days 10:29:06'. Right now we only
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* 365.2425/12 = 30.436875, or '30 days 10:29:06'. Right now we only
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* return an integral number of days, but someday perhaps we should
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* return an integral number of days, but someday perhaps we should
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* also return a 'time' value to be used as well.
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* also return a 'time' value to be used as well. ISO 8601 suggests
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* 30 days.
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*/
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*/
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#define DAYS_PER_MONTH 30 /* assumes exactly 30 days per month */
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#define DAYS_PER_MONTH 30 /* assumes exactly 30 days per month */
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#define HOURS_PER_DAY 24 /* assume no daylight savings time changes */
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#define HOURS_PER_DAY 24 /* assume no daylight savings time changes */
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/*
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/*
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* This doesn't adjust for uneven daylight savings time intervals or leap
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* This doesn't adjust for uneven daylight savings time intervals or leap
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* seconds, and it crudely estimates leap years.
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* seconds, and it crudely estimates leap years. A more accurate value
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* for days per years is 365.2422.
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*/
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*/
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#define SECS_PER_YEAR (36525 * 864) /* avoid floating-point computation */
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#define SECS_PER_YEAR (36525 * 864) /* avoid floating-point computation */
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#define SECS_PER_DAY 86400
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#define SECS_PER_DAY 86400
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