Date, Time & Calendar Tools
Free online age calculators, date difference counters, business workday schedulers, world clocks, live timers, perpetual calendars, and Unix timestamps 100% in-browser. All tools run 100% in your browser with zero server uploads and instant processing.
Age Calculator
Calculate exact chronological age in years, months, days, hours, and minutes with life milestones
Date Difference Calculator
Calculate the exact duration and time span between any two calendar dates
Days Between Dates Counter
Count calendar days, workdays, and weekends between two dates instantly
Add Days to Date Calculator
Add days, weeks, months, and years to any starting date to project future deadlines
Subtract Days from Date Calculator
Subtract days, weeks, months, and years to calculate past historical dates
Leap Year Checker
Verify if any Gregorian year is a leap year with rule explanations and leap tables
Business Days Calculator
Calculate net business working days between two dates excluding weekends and holidays
Working Days & Project Deadline Calculator
Add business working days to project start date to compute delivery deadlines
Week Number Calculator
Find the official ISO 8601 week number, day of year, and remaining days for any date
Time Duration & Hours Calculator
Calculate elapsed hours, minutes, and seconds between times with break deductions
Time Zone Converter & Meeting Planner
Convert time across global cities and find overlapping international business hours
World Clock & Multi-City Time Viewer
Live real-time digital clocks across major international financial centers
Countdown Timer
Real-time live countdown timer to holidays, product launches, and custom events
Exam Countdown & Study Planner
Target exam countdown timer with study hours available and chapter time allocation
Unix Timestamp & Live Epoch Clock
Real-time Unix epoch timestamp ticker with one-click clipboard copying
Unix Timestamp Converter
Bidirectional converter between Unix timestamps and human-readable dates
Date Format Converter
Convert dates between ISO 8601, US, European, RFC 2822, and SQL formats
Calendar Generator
Generate interactive and printable monthly calendars with custom week starts
Monthly Calendar View & Planner
Clean, printable monthly grid calendar with date navigation and event planning view
Perpetual Calendar (Year 1 to 9999)
Find the day of the week for any Gregorian calendar date from Year 1 to 9999 AD
Hijri & Gregorian Calendar Converter (محول التاريخ الهجري والميلادي)
Convert dates between Umm al-Qura Islamic Hijri calendar and Gregorian with moon-sighting offset
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