Category
Date & Time
Age, countdown, business days
Age Calculator
Calculate your exact age in years, months, days, hours, and seconds.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, weeks, days, hours, minutes, and seconds.
Time Duration Calculator
Add and subtract multiple time durations with automatic overflow normalization.
Day of Week Calculator
Find the day of the week for any date, plus ISO week number, day of year, and leap year status.
Business Days Calculator
Count business days between dates or add/subtract business days, with holiday calendars for 15 countries.
Work Hours Calculator
Calculate work hours for single shifts or weekly timesheets with overnight shift handling and overtime calculation.
Countdown Calculator
Live countdown timer to any date with preset events, real-time ticking display, and time-since mode for past dates.
Pregnancy Due Date Calculator
Estimate your due date using LMP, conception date, or IVF transfer date with weekly milestones and trimester tracking.
Time Zone Converter
Convert date and time between 400+ IANA timezones with DST awareness and multi-zone comparison.
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