While the calendar is vastly important in Judaism, it seems like it is barely applicable to non-Jews. The "big seven" Noahide laws seem to be perenially applicable; they dictate general rules for life rather than specific holy days or timed rituals. That being said, what calendar-dependent laws does halacha dictate that non-Jews must follows? I know of at least one possible example – the prohibition against keeping Shabbat (מיי' הל' מלכים ומלחמות פ"י הי"א , though technically this applies even if the non-Jew observes a Shabbat-like rest on any day of the week).
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