Date & time calculators
Age and day-count helpers.
Age Calculator
Exact age from a birth date.
Days Between Dates Calculator
Whole days between two calendar dates.
Add Days to a Date Calculator
Add or subtract days from a calendar date.
Business Days Between Two Dates Calculator
Count weekdays between two dates (Mon–Fri).
What Day of the Week Calculator
Find which weekday a calendar date falls on.
Week Number Calculator
ISO week number for a calendar date.
Unix Timestamp Converter
Convert Unix epoch seconds ↔ calendar datetime (UTC).