Date Time Calculator
On this calculator page you will find many calculations related to date and time. You can calculate days in month, week, date difference, day of week, and much more by selecting the base date and time.
2025-07-05 03:47:00 +00:00
Date & Time Calculator - Overview
Here you will find many operations to calculate the date and time. So, how you can use it, the operation and all
its features are described below.
Inputs:
- Date/Time: The main input used as the base for all calculations. You can set this using a
date and time picker.
- Current Timezone: Sets the timezone for the selected Date/Time. It also acts as the reference
point for operations like Time Until/Since Date.
Available Operations:
- Add Interval: You can add a specified period, like days, months, or hours to the base Date/Time.
So, use the Interval field, for example, P2D for 2 days.
- Subtract Interval: To subtracts duration from the Date/Time use the
Interval field, for example P1M for 1 month.
- Date Difference: This is duration calculation between date and time. So, use this to get the exact time duration between Date and Time in years,
months, days, hours, minutes, and seconds.
- Get Weekday: Here you will find the name of the weekday, such as Monday, (Mon) for a
selected date.
- Get Timestamp: Converts the selected Datea and Time into timestamp, such as number of seconds since
Jan 1, 1970 UTC.
- Time Until/Since Date: You can displays how much time has passed until a specified
date.
- Convert Timezone: You can converts the given Date/Time from the current timezone to a target timezone
to view local time in different regions.
- Get Week Number: Use this to find out the week number of the year for the selected date.
- Days in Month: It shows how many days are in the month of the selected date, such as 28, 29, 30, or 31.
- Leap Year: Use this to check if the year of the selected date and time is a leap year or not.
Note About Intervals: When you using "Add Interval" or
"Subtract Interval", use the ISO 8601 format to define the period. It begins with "P" followed by the
time values, for example -
- P1D for 1 day
- P2W for 2 weeks
- P1M3D for 1 month and 3 days
- PT1H30M for 1 hour and 30 minutes, here T separates date from time
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