UtilityKit
40+ fast, free tools. Most run in your browser only; Image & PDF tools upload files to the backend when you run them.
Date Calculator
Add or subtract days, weeks, months, or years from a start date.
About Date Calculator
Date Calculator mirrors spreadsheet DATE arithmetic yet clarifies month rollovers using native Date adjustments. Helpful when sprint math spans uneven months. UtilityKit performs the math in your browser so scheduling experiments stay private until you paste results elsewhere.
Why use Date Calculator
- Runs locally in your browser without accounts.
- Clear outputs you can copy into specs or fixtures.
- Built for quick iteration during UI and QA work.
How to use Date Calculator
- Open the tool and adjust inputs if needed.
- Generate or convert using the on-page controls.
- Review results and copy or download when satisfied.
When to use Date Calculator
- Building demo datasets
- Testing forms and validation rules
- Teaching or documenting sample payloads
Frequently Asked Questions
Is data stored on a server?
No — processing stays in your session unless the tool explicitly calls an API.
Can I use this for production sign-ups?
These utilities produce synthetic samples — verify policies before production use.
Are outputs guaranteed unique?
Random outputs may collide at scale — add checks for strict uniqueness.
Mobile friendly?
Yes — layouts follow UtilityKit responsive patterns.
Commercial use?
UtilityKit tools are free to use subject to your own compliance review.