Date & Time
Date differences, duration, business days, epoch, and world clocks.
Date Difference Calculator
Calculate the exact difference between two dates in years, months, weeks, days, hours, and minutes.
Date Calculator
Add or subtract days, weeks, months, or years from any given date.
Hours Calculator
Calculate total working hours, elapsed time, and pay with meal break deductions.
Minutes Calculator
Convert and calculate total minutes, elapsed minutes, and breakdown into hours and days.
Seconds Calculator
Convert seconds into days, hours, minutes, and perform second arithmetic.
Time Calculator
Add or subtract time expressions (hours, minutes, seconds) with instant result.
Working Days Calculator
Calculate exact business days and working hours between two dates, excluding weekends.
Add Business Days Calculator
Add N business days to a start date, skipping weekends and finding the target delivery date.
Add or Subtract Days Calculator
Easily add or subtract any number of days from today or any chosen calendar date.
Day of the Week Calculator
Determine which day of the week any past or future historical date falls on.
Week Number Calculator
Find the ISO 8601 week number, total weeks in the year, and week range for any date.
Julian Date Calculator
Convert Gregorian calendar dates to Julian Day Number (JDN), Modified Julian Date (MJD), and vice versa.
Time Duration Calculator
Calculate exact elapsed time between two timestamps with 12h/24h support.
Epoch Timestamp Converter
Convert Unix epoch timestamps to human-readable dates (GMT and local) and vice versa.
Timestamp to Date Converter
Convert numerical Unix timestamps into formatted UTC and local date-time strings.
Date to Timestamp Converter
Convert any human calendar date and time into Unix epoch seconds and milliseconds.
Countdown Timer
Set a custom countdown timer for exams, presentations, events, or cooking.
Online Stopwatch
Accurate digital stopwatch with lap times, split records, and millisecond precision.
Countdown to New Year
Real-time live countdown showing days, hours, minutes, and seconds until the upcoming New Year.
Days Until Christmas
Countdown clock calculating exact days, hours, and minutes remaining until December 25th.
Leap Year Checker
Check whether any year is a leap year according to Gregorian calendar rules.
Moon Phase Calculator
Calculate lunar phase (New Moon, First Quarter, Full Moon, Waning Gibbous) and illumination for any date.
Sunrise & Sunset Calculator
Estimate local sunrise, solar noon, sunset, and day length based on latitude and longitude.
Military Time Converter
Convert standard 12-hour AM/PM clock time into 24-hour military time and vice versa.