CalculatorFly

Accurately calculate age in years, months, and days from a date of birth. Online age calculator, birthday calculator, and date difference tool.

Convert time durations between years and decades.

Convert time between standard 12-hour AM/PM format and 24-hour military time format.

Convert time from minutes to hours (decimal and HH:MM format) and vice-versa.

Add or subtract durations to a date, or calculate the time duration between two dates.

Check if any given year is a leap year. See the rules and calculation steps for determining leap years.

Add or subtract multiple time durations. Calculate the total time from multiple entries of days, hours, minutes, and seconds.

Find the exact date and time for a duration "ago" from now. E.g., What was the time 5 hours and 30 minutes ago?

Easily convert times between different world time zones. Find the exact time in another city for scheduling meetings, calls, or travel.

Convert Gregorian dates to ISO 8601 week dates (YYYY-Www-D) and vice versa. Understand ISO week numbering rules.