日付とカレンダー

Calculate your exact age in years, months, days, total days, and next birthday countdown.

Calculate exact days, weeks, and hours between any two calendar dates.

Count the total number of calendar days between two selected dates.

Add or subtract days, weeks, months, or years to calculate past or future target dates.

Add a specific number of days, weeks, months, or years to any calendar date.

Subtract days, weeks, months, or years from any date to find historical dates.

Calculate working days and weekdays between two dates, automatically excluding weekends.

Lookup the ISO week number, day of the year, and leap year status for any date.

Check if any calendar year is a leap year (366 days) or common year (365 days).

Calculate how many days, hours, and minutes remain until a target date or event.

Accurately compute duration in years, months, weeks, and total days between dates.