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Date & Time Calculators
Age, date differences, time zones, workdays, and countdown calculations.
24 free calculators · No signup required
What Are Date and Time Calculators?
Durations, time zone conversions, countdowns, holiday dates, equinoxes, historical events. Calendar math is one of those things that seems simple until you actually try to do it — leap years, varying month lengths, daylight saving time. These tools handle the headaches for you.
I built these for scheduling, travel planning, and project management — the situations where getting a date wrong costs you a flight or a deadline. The age calculator and date difference tools are the most popular ones here, and the time zone converter gets heavy use from anyone working with international teams.
Frequently Asked Questions
How do I calculate my exact age?
The Age Calculator gives you years, months, and days from your birthdate to today. It handles leap years and uneven month lengths correctly — which is trickier than it sounds if you try to do it manually.
How many business days are in a year?
A typical year has 260–262 weekdays, depending on which day of the week it starts. Once you subtract federal holidays, most US workers end up with about 250–252 actual working days per year.
How do I calculate days between two dates?
The Date Difference Calculator handles it — just enter two dates and it gives you the gap in days, weeks, months, and years. It accounts for leap years automatically, so you don't have to think about edge cases.