Date & Time Calculators

Calculate exact calendar age from a birth date to a reference date, including total days and leap-day birthday handling.

Add or subtract calendar years, months, weeks and days from a start date with clear month-end rules.

Find the calendar difference between two dates, including completed years, completed months and remaining days.

Count days between two dates using elapsed or endpoint-inclusive conventions, with signed output when needed.

Count, add or subtract business days using custom weekend days and optional holiday dates.

Count working days for a custom weekly schedule and estimate working hours from hours per day.

Calculate elapsed time between two entered date-times and see total days, hours, minutes and seconds.

Find the difference between two clock times, including shifts or events that cross midnight.

Convert mixed duration parts into total hours, or add and subtract two duration blocks.

Convert mixed duration parts into total minutes, or add and subtract two duration blocks.

Convert mixed duration parts into total seconds, or add and subtract two duration blocks.

Calculate the static time remaining until a target date and time from the current date and time you enter.