Calculate ages, elapsed dates, weekdays, time arithmetic, time zones, Unix timestamps, countdowns and stopwatch intervals.
Calculate age from a date of birth.
Find the difference between two dates.
Count weekdays between two dates.
Add or subtract hours and minutes.
Convert a date and time between time zones.
Convert Unix timestamps and calendar dates.
Run a simple countdown timer.
Start, pause and reset an accurate browser stopwatch.
Months have different lengths, leap years add extra days, business-day rules can exclude weekends or public holidays, and time-zone offsets can change with daylight-saving rules. CalcNator therefore separates these jobs into focused tools instead of treating every time interval as a fixed number of seconds.
The Business Days Calculator excludes weekends only and does not automatically know public holidays. The Time Zone Converter relies on the browser's time-zone data. For contractual, legal or scheduling cut-offs, confirm the exact counting and time-zone rules that apply.
Read the Date Calculations Guide for examples and common pitfalls.