gentle X :
Less than day:use at{clock,noon, night,morning = at
But (in the morning, in the evening).
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Days, use on {Saturday, Monday}
Also, (on weekend) or (at weekend)
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More than day, use In{weeks,month, year, season} =in three days, in the morning, 1988, in summer,in January
2025-09-22 22:55:59