Comments (1)
hnqtran
commented on July 30, 2024
Currently, ISDSTIME subroutine (ioapi-3.2/ioapi/isdstime.F) has distinctive treatment for DST in year before and after 2007.
IF ( YEAR .LT. 2007 ) THEN
DAY0 = DAY0 + 6 - MOD( K + DAY0, 7 ) ! first Sun. in Apr.
K = 1 + MOD( K + DAY1, 7 ) ! day-number 1...7 for OCT31
DAY1 = DAY1 - MOD( K, 7 ) ! last Sun. in Oct.
ELSE
DAY0 = DAY0 - 31 ! March 1
DAY0 = DAY0 + 13 - MOD( K + DAY0, 7 ) ! second Sunday in March,
K = 1 + MOD( K + DAY1, 7 ) ! day-number 1...7 for OCT31
DAY1 = DAY1 + 6 - MOD( K, 7 ) ! first Sunday in November
END IF
The issue that Catherine described earlier was solved by modifying DAY1 to:
DAY1 = DAY1 + 7 - MOD( K, 7 ) ! first Sunday in November
(It is unclear why 6 was used here).
Tests:
juldate 11 3 2024
Saturday, 2024307
Daylight Savings Time in effect.
juldate 11 4 2024
Sunday, 2024308
Standard Time in effect.
from smoke.
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