Elapsed duration
The end date and time must not be before the start. The difference is calculated in milliseconds and then broken into larger time units.
Crossing midnight
Because both inputs include a date, overnight and multi-day durations do not require a special next-day toggle.
Timezone note
Both values are interpreted using the browser’s local timezone. For cross-timezone scheduling, convert both moments to the same timezone first.
Frequently asked questions
Are results saved or uploaded?
The calculation runs in your browser. Tooliyapa does not require an account to use this calculator.
Should I verify an important result?
Yes. For financial, health, academic, engineering, legal, or other consequential decisions, verify the inputs, assumptions, and result against an appropriate authoritative source or qualified professional.