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101 tools
This free date calculator computes the difference between two dates. It can also add to or subtract from a date. Both can deal with business days and holidays.
Calculate your age accurately by a set date with our easy-to-use age calculator tool. Answer the question, how many days old am I instantly! Try it now.
This free time calculator can add or subtract time values in terms of number of days, hours, minutes, or seconds. Also, learn the different concepts of time.
Calculate relativistic time dilation effects from Einstein's special relativity. See how time passes slower at high velocities, explore the twin paradox, and view real-world examples like GPS satellites and particle accelerators.
This birthday calculator estimates your age and the time left until your next birthday.
The business days calculator finds the number of working days in the given period of time.
The age difference calculator determines the age gap between two people.
If you want to find the phase of the Moon on a particular date, this Moon phase calculator is for you. You'll also learn how to work it out yourself!
Use the time unit converter to convert between milliseconds, seconds, minutes, hours, days, weeks, months, and years.
Free online date calendar unit converter. Convert between all date calendar units instantly with accurate results, formulas, and reference tables. No signup required.
Calculate countdown timer with our free tool. Get precise results instantly.
Free online Unix timestamp converter for instant epoch time conversions. Convert Unix timestamps to human-readable dates and vice versa. Features live timestamp display, multiple format outputs (local time, UTC, ISO 8601), and notable timestamp references. Perfect for developers, system administrators, and anyone working with computer time formats.
Convert Date to Unix Timestamp instantly. Free online converter with accurate results and clear explanations.
Convert Gregorian to Julian Converter instantly. Free online converter with accurate results and clear explanations.
Calculate military standard time with our free tool. Get precise results instantly.
Convert Quarters to Years instantly. Free online converter with accurate results and clear explanations.
Calculate sidereal solar time with our free tool. Get precise results instantly.
Convert time zone values instantly with our free tool. Get accurate results with clear explanations.
Free online timezone offset calculator for date and time calculations. Perfect for scheduling, planning, and time zone management.
Convert Week Number to Date instantly. Free online converter with accurate results and clear explanations.
Free online workdays calculator for date and time calculations. Perfect for scheduling, planning, and time zone management.
Free online centuries to years for instant time unit conversions. Includes practical examples, reference tables, and bidirectional conversion for scheduling, planning, and calculations.
Calculate date difference with our free tool. Get precise results instantly.
Free online days to hours for instant time unit conversions. Includes practical examples, reference tables, and bidirectional conversion for scheduling, planning, and calculations.