Months from today
Month arithmetic clamps overflow. The rule is deterministic and the same across the site.
Documented overflow rule
31 January + 1 month → last day of February. 31 March + 1 month → 30 April. This matches common civil “same day number or last valid day” behavior, not “add 30 days.”
Questions
January 31 plus one month?
The result is 28 February, or 29 February in a leap year. The original day number is kept when the destination month is long enough.
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