What this tool does
Find the interval between dates or add and subtract calendar time from a date.
Method
The engine uses date-only arithmetic for days and weeks and a documented clamp policy for month and year changes that land beyond the target month end.
Example
Find the days between two dates, or add one month to January 31 using the documented month-end rule.
Inputs and outputs
| You provide | You receive |
|---|---|
|
|
Privacy and data use
Calculated in your browser. Dates and offsets are not sent to a server.
Related tools
Common questions
Is it free?
Yes. The core tool and its standard result or export are free to use.
Do I need an account?
No for the core utility. An account or private management token is requested only for capabilities that must persist, such as editable dynamic QR links.
Can I trust the result?
The method and assumptions are visible above. Time-sensitive tools name their sources and freshness; important financial, safety, legal, or operational decisions should be verified with the primary authority.