Date and time tools

Calculate date differences, shift durations and ages, convert time units and compare time zones.

Date duration calculator

Count calendar days, weekdays and weekends, or add and subtract days.

Normalize hours, minutes and seconds and subtract another duration.

Calculate shift hours after unpaid breaks, including overnight shifts.

Calculate calendar age on an explicit date in years, months and days.

Convert seconds, minutes, hours and explicitly defined average months and years.

Convert dated local times between IANA zones with explicit daylight-saving ambiguity handling.

Compare live device time across named city time zones and local dates.

Create a dated monthly or weekly calendar, or a blank grid, with localized weekday labels and PDF/SVG export.

Print a blank or numbered clock face with optional hands, and view a live analogue clock with seconds.

Read a correctly installed sundial and estimate civil time using date, longitude and UTC offset.

Compare whole dog ages with a published size-specific human-age reference table.