Time & Date Tools

Work with time easily: convert time zones, parse timestamps, create countdowns, calculate ages, and more—right in your browser.

38 tools available

Blockchain Tools 1

Blockchain Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to dates and back for Ethereum, Bitcoin and EVM chains, with a Solidity duration calculator.

Calculators 10

Health & Fitness 10

Running Pace

Calculate running pace, time or distance for 5K, 10K, half, marathon. Negative-split pacing plan, splits table, Riegel predictor, min/km to mph converter.

Breathing exercise

Guided breathing timer with box breathing (4-4-4-4), 4-7-8 relaxing, energizing 4-2-4 and calming 4-4-6 patterns. Reduces stress, helps sleep — runs in your browser.

Eye exercise

Free 20-20-20 rule timer for digital eye strain relief. Every 20 minutes, look 20 feet away for 20 seconds. Reduces dry eyes, headaches and Computer Vision Syndrome.

Fasting Timer

Free intermittent fasting timer for 16:8, 18:6, 20:4, OMAD and custom protocols. Live countdown, eating window calculator (when can I eat next), autophagy stages.

Kegel exercise timer

Free Kegel exercise timer for men and women. Strengthen pelvic floor muscles with guided squeeze and release cycles, adjustable hold times, reps and sets.

Ovulation calculator

Find your ovulation date and most fertile days, including irregular cycles, plus an estimated due date. Free fertility calendar with luteal phase tracking.

Plank Challenge

Free plank challenge timer with customizable hold and rest periods, set tracking, and guided beginner/intermediate/advanced presets. Build core strength in your browser.

Pregnancy due date calculator

Calculate your pregnancy due date from LMP, conception, or ultrasound. Free EDD calculator with trimester tracking and ACOG term-window dates.

Sleep cycle calculator

Calculate the best time to wake up or go to sleep based on sleep cycles. Free sleep calculator to help you wake up refreshed during light sleep phases.

Tabata HIIT timer

Free Tabata and HIIT interval timer. Classic 20/10 × 8, 30/30, 45/15 presets or custom work/rest, with audio cues and round tracking. Runs in your browser.

Developer Tools 1

Generators 1

Cron Expression Generator

Build, parse and validate crontab and Quartz cron expressions. Paste any line or @daily macro, expand it, see human-readable text and next run times.

Hardware Tools 1

Input Devices 1

Typing Speed Test

Free typing speed test: live WPM, net WPM, CPM and real accuracy. Words, sentences, quotes and code modes, 30-300s runs, private offline, CSV/JSON export.

Time Tools 25

Lunar Calendar

Convert solar to lunar dates both ways. Shows zodiac, stem-branch, leap month, 24 solar terms, Chinese New Year date. Chinese & Vietnamese, 1900-2100.

Work Shift Scheduler

Free shift scheduler and rota maker. Build rotating employee rosters, check weekly hours and rest periods for labor compliance, and export CSV or ICS.

Equinox & Solstice

Find exact UTC dates and times of equinoxes and solstices from 1800 to 2200, convert to your timezone, and export an .ics calendar file for any year range.

Daylight Duration

Calculate daylight hours, sunrise, sunset, solar noon and civil, nautical, astronomical twilight plus golden hour for any coordinates and date.

Season Calendar

Find the exact UTC date and time of every equinox and solstice for any year 1900-2100, plus season start and end dates for both hemispheres.

Sun Path

Plot the sun path diagram, golden hour, solar altitude and azimuth for any date. Get peak noon altitude, shadow ratio and panel tilt for solar and photo work.

Sunrise Sunset

Free sunrise sunset calculator with golden hour, blue hour, day length and solar noon. NOAA solar algorithm for photographers, drone pilots and solar planners.

Moon Phase Calendar

Free moon phase calendar with illumination percentage. Generate a monthly or yearly lunar calendar from 1900 to 2100, print or download as PDF.

Age calculator

Calculate exact age in years, months, days, hours, seconds. Shows zodiac, day of week born, life milestones (10k days), and life expectancy comparison.

Audiobook Speed Calculator

See remaining listening time at 1×–3×, the daily minutes and player speed you need, and the calendar date you finish an audiobook or podcast by your deadline.

Birthday calculator

Count the exact days, weeks, and months until your next birthday, see the weekday and age you turn, and export it to your calendar as a yearly reminder.

Calendar Generator

Make printable A4/Letter calendars: mark deadlines on exact days, show ISO week numbers, Monday/Sunday start, holidays and notes. Download PDF or print.

Countdown Timer

Free HH:MM:SS countdown timer with alarm, browser notification, fullscreen and tab-title countdown. Clock-anchored so it stays accurate in background tabs.

Date Difference Calculator

Days, weeks, months and years between any two dates. Business days, leap-year aware, DST safe, ISO 8601 dates. For age, contracts, project planning.

Epoch Converter

Convert Unix timestamps to human-readable dates and back, in UTC or any IANA timezone with DST. Batch mode, auto-detect seconds/ms/us/ns. Free for developers.

ISO Date Converter

Convert ISO 8601 to Unix epoch, RFC 3339, SQL DATETIME, week date and ordinal date with 4 simultaneous timezones, relative time, and Excel/Julian serials.

Meeting Time Planner

Free meeting scheduler across time zones with per-person working hours, meeting duration and .ics export. Find the best slot for every remote team member.

Pomodoro Timer

Free Pomodoro timer with ambient sounds, session timeline, and CSV export. 25-min focus sessions for deep work, time tracking, and ADHD focus.

Sleep Cycle Calculator

Find the best bedtime (or wake time) using 90-minute REM/NREM cycles. Adds sleep-onset latency. Shows 6, 5, 4, 3-cycle options + sleep stages breakdown.

Stopwatch

Precise online stopwatch with unlimited laps, split-time analysis, fastest/slowest and consistency stats, CSV export, fullscreen and keyboard shortcuts.

Time Add Subtract Calculator

Add or subtract years, months, days, hours, minutes and seconds from any date. Calendar-aware with overflow rollover, a business-days mode and ISO 8601 output.

Time Interval Splitter

Split time ranges into equal intervals with buffer breaks between slots. Build appointment slots, shift schedules, and Pomodoro blocks with a visual timeline.

Timezone Converter

Convert time between any two timezones instantly, with DST handling, weekend flags and a business-hours overlap strip for meetings. Free, no signup.

Working Days Calculator

Count net working days between two dates or add/subtract business days, excluding weekends and holidays. Custom workweek (Mon-Fri, Fri-Sat, 6-day) for global pros.

World Clock

See current time in any city worldwide, side by side. Compare 5+ timezones at once, view UTC offsets, schedule across DST. Free, no signup, mobile-friendly.