Everyday calculators
Dates, time, travel and other daily helpers.
Calculate exact age in years, months, days, and total elapsed days.
Find the calendar and total-day difference between two dates.
Calculate elapsed hours and minutes between two times, including overnight.
Count working days between two dates.
Total hours across multiple work shifts.
See live time remaining or elapsed.
Convert local times between time zones.
Add or subtract calendar time from a date.
Find the weekday for any valid date.
Calculate a credit-weighted GPA from multiple courses.
Calculate weighted grades and target scenarios.
Estimate sleep duration and cycle times.
Estimate trip fuel use and cost in US or metric units.
Find the exact gap between two times, including overnight and multi-day gaps.
Convert Unix and Linux epoch time to a date, and back again.