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Default the day of the month to 1 in strptime/1 (#3679)

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A format without %d left the day of the month at 0, which mktime and
todate read as the last day of the previous month, and the weekday was
wrong for dates in January and February of 1900 and 2100.

Start parsing from the 1st, so a format without a day now gives the
first of the month, and a time-only format no longer outputs the 8 and
367 placeholders for the weekday and day of the year. This also fixes
the weekday of dates in January and February of 1900 and 2100.
This commit is contained in:
Jay Hemnani authored and GitHub committed 2026-10-25 14:40:52 +09:00
1 parent 864d769d88
commit ac35c7dcbb
2 files changed
+22 -8
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tests/jq.test
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@@ -1988,6 +1988,15 @@ try strflocaltime("%c" * 10) catch .
"2015-03-05T23:51:47Z"
[[2015,2,5,23,51,47,4,63],1425599507]
# a format without a day of the month gives the first of the month
[("2024-06" | strptime("%Y-%m")), ("2024" | strptime("%Y")) | ., todate]
null
[[2024,5,1,0,0,0,6,152],"2024-06-01T00:00:00Z",[2024,0,1,0,0,0,1,0],"2024-01-01T00:00:00Z"]
"10:15" | strptime("%H:%M")
null
[1900,0,1,10,15,0,1,0]
# Check day-of-week and day of year computations
# (should trip an assert if this fails)
last(range(365 * 67)|("1970-03-01T01:02:03Z"|strptime("%Y-%m-%dT%H:%M:%SZ")|mktime) + (86400 * .)|strftime("%Y-%m-%dT%H:%M:%SZ")|strptime("%Y-%m-%dT%H:%M:%SZ"))