Time Calculator
Six in-browser calculators for everyday date and time math. Compute the gap between two dates, add or subtract a duration, find your age in days, or convert a Unix timestamp — every tool runs locally in your browser.
Date-time difference
Returns the gap between two date-time values in days, hours, and minutes.
Add or subtract a duration
Take a starting date-time and add (or subtract) days, hours, and minutes.
Days between two dates
Whole-day count between two calendar dates, plus weeks and months breakdown.
Age calculator
Years, months, and days from a birthdate to a target date.
Hours and minutes
Add several HH:MM values together — useful for tracking work hours or training time.
Unix timestamp converter
Convert between Unix seconds and a human-readable date.
Related tools
Calculator pages should connect to the rest of the site so visitors can keep moving between reference pages and utilities.