Date & Time Calculators
Date differences, age, timezones
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Date Difference
Days between two dates
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Age Calculator
Exact age in years, months, days
Add / Subtract Days
Find a future or past date
Day of the Week
What day is any date?
Business Days
Working days between two dates
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Unix Timestamp
Epoch ↔ human date
Week Number
ISO week of the year
Countdown
Days until an event
Time Calculator
Add and subtract time values
Timezone Converter
Convert across UTC offsets
Leap Year Checker
Is a year a leap year?
Quarter of Year
What quarter is a date in?
Workday Estimator
Add N business days to a date
Duration Calculator
HH:MM:SS arithmetic