make_datetime(year = 1999, month = 12, day = 22, sec = 10)
## "1999-12-22 00:00:10 UTC"
make_datetime(year = 1999, month = 12, day = 22, sec = c(10, 11))
## "1999-12-22 00:00:10 UTC" "1999-12-22 00:00:11 UTC"
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