Add Time
Add days, hours, minutes, and seconds to a date/time.
Tool workspace
Adds days/hours/minutes/seconds to a start date/time in your browser’s local timezone. Leave unused duration fields blank (treated as zero).
How it works
Enter a start date/time and the duration parts to add (days, hours, minutes, seconds). Blank duration fields count as zero.
Uses your browser’s local timezone for datetime-local values. Shares duration parsing with Subtract Time. Empty start or all-blank duration clears the result—no error.
Uses your browser’s local timezone for datetime-local values. Shares duration parsing with Subtract Time. Empty start or all-blank duration clears the result—no error.
Examples
- 2026-01-01T10:00 + 1 hour 30 minutes → 2026-01-01T11:30:00
- Add 2 days to cross midnight boundaries
Privacy
Privacy: this tool processes date/times locally in your browser. We do not log or store what you enter. Login is not required.
FAQ
Are my times uploaded?
No. Addition runs entirely in your browser.
Which timezone is used?
Your browser’s local timezone for datetime-local values.
Do I need an account?
No. All published tools work for guests without login.