How many days between two dates? Whether you're counting down to a deadline, measuring a project timeline, or checking a notice period, this calculator gives you the exact difference — total days plus an approximate breakdown in weeks, months and years, and a precise calendar breakdown like "1 year, 2 months, 3 days".
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The total days is the exact count of midnights between the two dates (UTC, so timezones can't skew it). The approximations divide that count:
Weeks = days ÷ 7 · Months ≈ days ÷ 30.44 · Years ≈ days ÷ 365.25
30.44 is the average month length (365.25 ÷ 12) and 365.25 is the average year length including leap years. The exact breakdown instead walks the real calendar — full years, then full months with their true lengths, then leftover days.
From 1 Jan 2024 to 15 Mar 2024:
Total days is the number to use for deadlines, interest calculations and notice periods. Exact breakdown is the human-friendly phrasing ("2 months, 14 days"). The ≈ weeks/months/years figures are quick approximations — fine for planning, but don't use the month figure for anything contractual, since real months vary from 28 to 31 days.
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Content last reviewed on 2026-10-06.