Why is “same day next month” not always a simple calculation?
Show answer & explanation
Answer: Because months have different lengths, so some dates do not map neatly
Because months have different lengths, so some dates do not map neatly ✓ — Correct! Calendar arithmetic is tricky because months vary in length, so dates like January 31 do not fit neatly into every following month.
Because computers stop counting after 30 days — Wrong. Computers do not stop counting after 30 days.
Because time APIs only support weeks, not months — Wrong. Time APIs do support months; the challenge is that month arithmetic follows calendar rules, not fixed durations.
Go deeper: Gregorian calendar
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