Free date & time tools — age, countdown, workdays, time zones
Everything that needs counting between two dates: your exact age in years, months and days, a countdown to any event, business-day and date math that skips weekends, ISO week numbers, leap-year checks and a time-zone converter for scheduling across countries. Useful for contracts, deadlines, payroll, travel and planning calls that span the globe.
Age Calculator (years, months, days, weeks, hours)
Calculate exact age in years, months, days, weeks, and hours from any birth date to any target date.
Free Countdown Timer 2026 — Days, Hours, Minutes, Seconds (No Signup)
Free online countdown timer. Pick any date & time, see days/hours/minutes/seconds tick down live. Add event title, watch elapsed time after target — no signup.
Unix Timestamp Converter (sec, ms, ISO, local)
Convert between Unix timestamps (seconds or milliseconds) and human-readable dates. Shows ISO 8601, local time, and relative time.
Date Calculator (add/subtract days, or difference between dates)
Add or subtract years/months/days from a date, or find the precise difference between two dates including business days.
Timezone Converter (compare time across multiple zones)
Convert one moment in time across multiple timezones at once. Add or remove zones; great for scheduling international meetings.
Cron Expression Tester (preview next 5 runs)
Test cron expressions and see the next 5 scheduled runs in your local timezone. Validates fields, supports ranges, lists, and steps.
Pomodoro Timer (25/5/15 with audio cue)
Classic Pomodoro Technique timer: 25 minutes focus + 5 minutes short break, every 4th break is 15 minutes. Audio chime when each phase ends.
Leap Year Checker (with rule explanation)
Check if a year is a leap year and see why. Shows February days, year days, and the previous and next leap years.
Workdays Calculator (skip weekends + holidays)
Count business days between two dates, excluding weekends and any holidays you list. Customizable: include Saturday or Sunday as workdays if needed.
ISO Week Number Calculator (week-of-year)
Find the ISO 8601 week number, ISO weekday, and week date range for any calendar date. Includes day-of-year and weeks-in-year.
Age Difference Calculator (between two people)
Calculate the exact age difference between two people in years, months, days, plus totals in weeks, days, and hours.
Moon Phase Calculator (any date, illumination %)
See the moon phase, age in days, illumination percentage, and dates of the next new and full moons for any calendar date.
Stopwatch (millisecond precision, lap times)
High-precision in-browser stopwatch with start/pause, lap recording, and split-time calculation. Millisecond display, monotonic clock for accuracy.
Hours Calculator — Add, Subtract & Convert Time
Add or subtract time durations, find the gap between two times, and convert hours to decimal — all in one tool.
Day of the Week Calculator — Find Any Weekday
Enter any calendar date and instantly see which day of the week it falls on.