三彌勒經疏 1.18

1.18

問：時既別，何故不說四時六時等？答：日夜時分諸方不定故，謂經於諸方令流通故，故分說多時。

Question: Since the times are distinct, why not state the four seasons, the six periods of the day, and so forth? Answer: Because the divisions of day and night are indeterminate in different regions; that is, because the sūtras are to be circulated across all regions, the divisions would state many different times.