Time & Date Tools
Use exact network time, world clocks, time-zone conversion, meeting planning, stopwatch, timer and event countdown on phone or desktop.
Digital Clock
Display a themeable digital clock with timezone, 12/24-hour format, date, seconds and fullscreen mode.
Analog Clock
An online analog clock with multiple face templates, adjustable size, timezone selection, second-hand motion and fullscreen display.
Online Stopwatch
A real elapsed-time stopwatch with pause, resume, laps, fastest and slowest records, fullscreen and keyboard controls.
★Event Countdown
Create a titled countdown to an IANA-zone date and time, including past targets, fullscreen mode and database-free share links.
★Date Countdown
Choose a target date and time to see remaining days, hours, minutes and seconds for events and deadlines.
Pomodoro Timer
Run Pomodoro focus and break intervals with repeating stages and an alert when each period ends.
★Alarm Clock
Set an alarm time and label to play a browser alert while the page remains open.
World Clock
Add and reorder cities to compare local date, weekday, UTC offset, difference from your location and daylight-saving changes. Your city list stays in localStorage.
★Time Zone Converter
Enter a date, time and source IANA zone, convert it to multiple cities, label previous/same/next day and apply daylight-saving rules.
★Age Calculator
Enter a birth date and comparison date to calculate age in years, months, days and total elapsed days.
Date Interval Calculator
Calculate days, weeks, months and years between two dates, including direction and a calendar interval.
Interval Timer
Set work and rest durations with repeat rounds for interval training, study sessions and focused routines.
Metronome
Set beats per minute and meter to play a steady rhythm for music practice, timing and tempo training.
Exact Network Time
Estimate network-calibrated time, device clock offset, round-trip latency and uncertainty from Cloudflare samples, with milliseconds and automatic resync.
★Clock Accuracy Test
Measure server time repeatedly, select low-latency samples and estimate whether your computer or phone clock is fast or slow, including test quality and network uncertainty.
International Meeting Planner
Add cities, compare a 24-hour timeline, set working hours and find less disruptive meeting slots across time zones.
★Online Timer
Set hours, minutes or seconds with presets, pause/resume, sound, notifications and target-time recovery after backgrounding.
★Fullscreen Digital Clock
A large digital clock for meeting rooms, classrooms and landscape phones, with seconds, date, weekday, theme and Wake Lock controls.
Business Days Calculator
Count business days, weekends and total days between two dates with optional inclusive dates and custom holidays.
★Date Add or Subtract Calculator
Add or subtract years, months, weeks and days from a date and show the resulting weekday and ISO date.
Daylight Saving Time Checker
Check daylight-saving transitions, local change times and UTC-offset changes for an IANA time zone and year.
Sunrise & Sunset Calculator
Calculate sunrise, sunset, solar noon, day length and civil twilight from date, coordinates and time zone.
Week Number Lookup
Look up an ISO week number, week-year, day of year, quarter and week of month for any date.
Year Calendar
Generate a complete 12-month year calendar with selectable week start, optional ISO week numbers and printing.
Time Zone Abbreviation Lookup
Look up abbreviations, full names and UTC offsets, or search possible IANA zones for abbreviations such as EST or NZDT.
Printable Calendar
Create an A4-friendly monthly or yearly calendar with a custom title, week start and optional notes area.
About these tools
Time, date, time-zone, timer and calendar tools for clocks, date math, DST and international planning.
City time pages
A small set of useful city pages uses real IANA rules rather than mass-producing thin pages.