Date & Time Calculators (51)

Working out a date or a duration by hand always goes wrong somewhere, which is why this collection covers an age calculator, a full date calculator for the difference between two dates, and a time calculator for adding, subtracting, or comparing hours and minutes. There is also a timezone converter and a meeting overlap finder for coordinating across regions, a working days counter, a Unix timestamp converter, and a time card calculator for real payroll hours.

For anything anchored to a specific date, this collection covers 30, 45, 60, 90, 100, 120, and 180 days from a date, plus 6 months from a date, days until an event, a project deadline calculator, and sprint velocity for agile teams. Round it out with an anniversary calculator, birth year and date of birth from age, birth date from death date, a leap year checker, moon phase, a palindrome date checker, BC to AD conversion, pregnancy countdown, half birthday, day of the year, expiration date, weekday count between dates, an 8 hour shift calculator, decimal time conversion, sidereal time, and a full set of time adding, subtracting, and countdown tools for everyday scheduling.