Online Date Calculator

The Online Date Calculator is a precise tool for calculating time intervals. It can calculate the number of days between two dates, or add/subtract days from a specified date to determine a future or past date.

This tool supports second-level precision and is suitable for work scheduling, event planning, anniversary calculations, exam countdowns, and more.

Main Features

• Date Interval Calculation: Enter the start and end dates to quickly calculate the difference in days, years, months, hours, minutes, and seconds.
• Countdown Calculation: Easily calculate how long until a target date, suitable for exam countdowns, birthdays, and more.
• Birthday/Anniversary Days Calculation: Calculate the number of days, minutes, or seconds since birth or since a special date.
• Future/Past Date Calculation: Calculate the exact date a certain number of years, months, weeks, days, hours, minutes, or seconds from now.

How to Use

1. Date Difference: Set the start and end dates, then click "Calculate".
2. Future/Past Date: Select the start date, enter the amount and unit to add or subtract, then click "Calculate".

FAQ

• Only supports Gregorian calendar calculations, lunar calendar is not supported.
• All calculations support second-level precision.
• Does not automatically exclude weekends or public holidays.
• Completely free to use, no registration required.