Time & Date Calculators Calculators
Four free tools for everyday date and time math — from calculating exact age to converting across world time zones.
Date and time calculations look simple until leap years, month lengths, and time zone offsets get involved. These four tools handle the edge cases automatically so you get a reliable answer every time.
The Age and Date calculators both apply the standard Gregorian leap-year rule correctly — a year divisible by 4 is a leap year, unless it's divisible by 100 and not by 400, which is why 1900 and 2100 aren't leap years but 2000 was. Dates from the year 1900 through 2100 are supported, which covers essentially every practical date calculation.
🕐 All Time & Date Calculators
🧭 Which Time & Date Calculator Should You Use?
Finding your exact age
The Age Calculator breaks your age down into years, months, days, and even days until your next birthday.
Scheduling across countries
The Time Zone Converter handles all 24 world time zones, including daylight saving time.
Counting days between two dates
The Date Calculator finds the exact number of days, weeks, or business days between any two dates.
Working out a weighted grade
The Grade Calculator factors in different assignment weights to show your current or target grade.
❓ Frequently Asked Questions
❓ Does the Time Zone Converter account for daylight saving?
Yes — it adjusts for DST automatically for regions that observe it.
❓ Can the Date Calculator count only business days?
Yes, it has a dedicated business-day mode that excludes weekends.
❓ Does the Age Calculator handle leap years correctly?
Yes — it uses the actual calendar between your two dates rather than assuming every year is 365 days, so someone born on February 29th still gets an accurate age.
❓ What's the earliest or latest date I can use?
The Age and Date calculators accept dates from the year 1900 to 2100, which covers virtually every real-world use case.