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A year is a leap year if it is divisible by 4, except century years, which must also be divisible by 400. So 2000 was a leap year but 1900 was not — the tool applies this full Gregorian rule, not just the divisible-by-4 shortcut.
A solar year is a little under 365.25 days, so the century rule trims the small over-correction that a plain four-year cycle would accumulate. It keeps the calendar aligned with the seasons over centuries.
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Years, months, and days between birth date and today.
Days and weeks between two dates.
Add or subtract days from a date.
Weekdays between dates with optional India 2026 holidays.
Hours, minutes, seconds between two dates.
