Date Calculator
Weekday Calculator
Find the weekday, day of year, ISO week, and year page for any date.
Date
Week numbers use ISO 8601 rules: weeks start on Monday and week 1 contains January 4.
Result
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Days Between Dates
Count calendar days between two dates.
Date Add/Subtract
Add or subtract days, weeks, months, and years.
Time Duration
Measure elapsed time across dates and time zones.
Week Number Calculator
Convert dates to ISO week numbers and week ranges.
Age Calculator
Calculate exact age and milestone dates.
Date Patterns
Find same-calendar years and simple date facts.
Batch Dates
Add or subtract days from many dates at once.
Recurring Dates
Generate simple daily, weekly, or monthly date lists.