Measure durations, count working days, add calendar units, and build accurate event countdowns.
Calculate a complete calendar duration and total elapsed days between two dates.
Start with this calculatorCount elapsed days, selected calendar dates, weekdays, weekend days, and optional excluded dates.
Find complete seven-day weeks, remaining days, and decimal weeks between dates.
Calculate completed calendar months and remaining days without treating every month as 30 days.
Calculate completed years, remaining months and days, anniversaries, and fractional years.
Add or subtract years, months, weeks, and days with explicit month-end behavior.
Count working days or add business days using your workweek and custom holidays.
Calculate a shift or time interval, including overnight work and unpaid breaks.
Track an annual or custom recurring anniversary and see completed years, the latest occurrence, and the next five dates.
Create a private live countdown for an event, deadline, launch, trip, or personal goal.
Date arithmetic is not one operation. Counting elapsed days, selected calendar dates, working days, complete months, or clock hours can produce different answers for the same endpoints. Record which boundary is included and which calendar or timezone rule is active.
Choose the calculator by the unit the real task uses. Converting a day result into months, or a calendar-month result into thirty-day blocks, can hide the month-end rule that produced the date.
Editorial review:Elapsed duration measures the distance between two endpoints. Inclusive date counting can include the start date, the end date, or both because it is counting labeled calendar dates rather than only the gap. For deadlines, rentals, travel, or service periods, copy the wording from the governing rule before selecting the boundary option.
A weekday count can exclude Saturday and Sunday, but a business-day answer may also depend on national holidays, regional closures, company schedules, or emergency days. Record the weekend definition and any excluded dates with the result. Do not present a generic weekday total as an official delivery, court, banking, or employment deadline.
Adding one month to the 29th, 30th, or 31st can reach a month without that day. A calendar tool must either constrain to the last valid day or apply another stated rule. Repeated schedules should reuse the same policy; otherwise a sequence can drift after the first short month.
The label beside each tool tells you whether the answer is an exact calendar result, a rule-based result, an estimate, or entertainment.
