Dates calculators

Ages, gaps, and countdowns on the real calendar.

Age calculator Exact years, months, days — and total days Days between dates Exact count, weeks, weekday estimate Add or subtract days What date is 90 days from today Countdown Live days, hours, minutes to any date Hours worked Shift length with breaks, decimal + h:mm Sleep cycles Bedtimes that dodge mid-cycle alarms Days until… Live countdowns: Christmas, Easter, New Year +8 more Dog age Real human years — 2019 formula, not ×7
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Every dates calculator here follows the same rules: results update live as you type, the formula is shown with a worked example, and the math runs entirely in your browser — nothing you enter is uploaded anywhere. More dates calculators are added regularly; each one is unit-tested against published reference values before it ships.