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Calculator Preferences
Date Time Calculator

This calculator will instantly subtract or add days, weeks, months, and years from or to a date of your choosing. Includes optional starting and ending time in hours, minutes, and seconds. Result also includes the day of the week for the calculated date. Many interesting uses!

Learn More

Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Date:

Starting date:

Select the month and day and enter the 4-digit year of the date you want to add to or subtract from. Note that the year must be greater than 0 and less than 4000.

Time:

Starting time:

If you want to set a starting time (optional), change the hour, minute, and second selection to the desired time (or tap the "Begin", "Noon", or "Now" buttons to set a general time of day). Changing the selection back and forth from the Now option to another option will update the time setting to the new Now time.

Operation:Operation:Operation to perform:Choose operation to perform:

Add or subtract time span:

Select Add or Subtract.

Time spans to add or subtract:

Time span to add or subtract:

Enter the number of each time unit you would liked added to or subtracted from the starting date. Note that the results will differ between adding or subtracting 1 year or 1 month versus adding or subtracting 365 days or 30 days. This is due to effects of daylight savings time, leap years, and calendar months having different number of days.

Seconds
Minutes
Hours
Days
Weeks
Months
Years
Result date and time:

Result date and time:

This is the calculated date and time after adding or subtracting the entered date and time units. Note that years and months are added or subtracted first, and then the weeks, days, hours, minutes, and seconds are added or subtracted after that.

If you would like to save the current entries to the secure online database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

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Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.

 

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