Date/Time Math

[chriseolive]

What type of request is this?

New tool idea

Clear and concise description of the feature you are proposing

Time between dates and other date math -- depending on how far you wanna go with it. Julian to Gregorian, etc. I just wanna validate date math independently outside of any development.

Is their example of this tool in the wild?

Sure - Google date math.

Additional context

No response

Validations

• Check the feature is not already implemented in the project.
• Check that there isn't already an issue that request the same feature to avoid creating a duplicate.
• Check that the feature can be implemented in a client side only app (IT-Tools is client side only, no server).

[willjayyyy]

Hi! @chriseolive .

The Date/Time math features requested here have been implemented in next-tools.

I’ve added a new Date Calculator tool that supports:

• Date addition & subtraction (e.g., add 3 weeks to a date)
• Duration calculation (calculate the difference between two dates)
• Time unit conversion

More generally, next-tools is a heavily refactored version of it-tools:

• Fully rebuilt UI with shadcn/ui for a cleaner experience
• Real i18n support, including translations inside individual tools
• New tools added and multiple long‑standing issues fixed

You can use the Date Calculator here:
https://www.next-tools.dev/date-calculator

Repository:
https://github.com/willjayyyy/next-tools

[sharevb]

Hi @chriseolive , there is also in my fork: https://sharevb-it-tools.vercel.app/date-converter , https://sharevb-it-tools.vercel.app/which-day , https://sharevb-it-tools.vercel.app/date-duration-calculator , https://sharevb-it-tools.vercel.app/timezone-converter , https://sharevb-it-tools.vercel.app/days-calculator and https://sharevb-it-tools.vercel.app/duration-calculator