Date & Time Calculators

Perform various date and time calculations.

Add/Subtract from Date

Start Date

Day:

Month:

Year:

Date:

Today

Hour:

Minute:

Second:

Now | Start of Day | Noon

Remove the time

Add/Subtract:

Years:

Months:

Weeks:

Days:

Hours:

Minutes:

Seconds:

Repeat

Time Unit Conversions

Hours to Minutes

Hours:

Minutes:

Hours & Minutes to Seconds

Time (Hours & Minutes):

Total Seconds:

Difference Between Two Dates

Date 1:

Date 2:

Difference:

How to Use the Date & Time Calculators

This page features three distinct tools designed to handle common chronological math. Here's a breakdown of what each tool does and how to use it.

1. Add/Subtract from Date

This is a powerful tool that lets you add or subtract any combination of time units from a starting date and time. It's perfect for planning deadlines, scheduling future events, or tracing past dates.

Start Date: Use the Day, Month, and Year dropdown menus to pick your starting date. You can also click the calendar icon to use a date picker, or click Today to quickly set today's date.
Start Time: Choose a starting time using the Hour, Minute, and Second dropdown menus. Quick presets are available:
- Now – sets the current date and time.
- Start of Day – sets the time to 00:00:00.
- Noon – sets the time to 12:00:00.
If you only need a date result, click "Remove the time" to exclude time from the calculation.
Add/Subtract Mode: Choose (+) Add to move forward in time, or (-) Subtract to move backward.
Time Units: Enter values in any combination of Years, Months, Weeks, Days, Hours, Minutes, and Seconds. You can fill in as many or as few as you need.
Repeat: Enable the Repeat checkbox and set a count to apply the same offset multiple times in sequence. For example, adding 1 Month repeated 6 times will show the date for each of the next 6 months.
Result: Click Calculate New Date to see the resulting date(s) displayed with the full day of the week and time.

2. Time Unit Conversions

This section allows you to quickly translate durations from hours down to minutes and seconds.

Hours to Minutes: Enter a decimal value like 1.5 (one and a half hours) and click Convert to get the exact total in minutes.
Hours & Minutes to Seconds: Input whole numbers for Hours and/or Minutes to calculate the total duration in pure seconds.

3. Difference Between Two Dates

This tool calculates the exact span of time between any two dates on a calendar.

Date 1 & Date 2: Select any two dates. The calculator is smart enough to figure it out regardless of which date is older or newer.
Difference Output: The result provides a comprehensive breakdown. It shows the total difference in pure days, an approximate breakdown into Years/Months/Days, and also calculates the exact time duration in total hours, minutes, and seconds!

💡 Practical Examples

Event Planning: Need to know the exact date 90 days before a wedding to send invitations? Set the wedding date, choose (-) Subtract, enter 90 in the Days field, and calculate.
Monthly Milestones: Want to see when your next 12 monthly payments are due? Set today's date, add 1 Month, enable Repeat with 12 times, and get all 12 dates at once.
Age Calculation: Put your birth date in Date 1 and today's date in Date 2 in the Difference Between Two Dates tool to find out exactly how many days old you are!
Travel Countdown: Use the Difference Between Two Dates tool to calculate the exact number of days, hours, and minutes until your next trip.