Time
Time calculators
Age, date math, due dates, and day counts.
Date tools count calendar days, add or subtract a span, show age in years-months-days, or estimate a pregnancy due date from a last period. They use the browser’s local date. They do not skip statutory holidays unless you switch to weekdays only on the days-between page.
A Monday to the next Monday is 7 days. Hotel nights are often one less than the day count. Confirm court, insurance, or school deadlines with the office that set the rule.
Time
Days Between Dates Calculator
Count days, weeks, and weekdays between two dates.
Time
Age Calculator
Calculate age in years, months, and days from a date of birth.
Time
Add or Subtract Days Calculator
Add or subtract days, weeks, or months from a date.
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Due Date Calculator
Estimate a pregnancy due date from the last menstrual period or conception date.