Date & Time

Convert time between different time zones worldwide. World clock and time zone calculator for scheduling international meetings. Compare times across multiple cities and countries.

Calculate exact age in years, months, weeks, days, hours from date of birth. Free age calculator with next birthday countdown. Find your age down to the second.

Online countdown timer for events, meetings, and Pomodoro technique. Customizable timer with alarm sound. Track time remaining for deadlines and important dates.

Find ISO week number for any date. Week number calculator with date range display. Useful for project planning and scheduling with week-based calendars.

View current time in multiple cities worldwide. Live-updating world clock with 30+ major timezones, day/night indicators, 12h/24h toggle, and UTC offsets. Save your favorite cities.

Find the best meeting time across time zones. Visual 24-hour grid with working hours highlighted. Overlap detection. Copy invite text with converted times.

Compare time across up to 8 time zones side by side. Slider to pick time. Business hours highlighted. UTC offsets shown.

Public holidays for 10 countries. Filter by month and year. Countdown to next holiday. Mark favorites. Copy holiday list.

Multiple simultaneous cooking timers. Presets: Egg, Pasta, Rice, Chicken. Audio alerts. Color-coded. Up to 6 concurrent timers.

Set alarms across timezones. Audio alerts. Snooze. Multiple alarms. Active/inactive toggle. Color-coded by region.

Schedule employee work shifts over 7 days. Member shift assignment, weekly hours total, conflict detection, copy schedule.

Calculate daily and weekly work hours with break deductions and overtime. Net hours, overtime threshold, total pay estimation.

Compare times across multiple world cities to find ideal meeting slots. 24-hour timeline bar highlighting overlapping working hours.

Create customizable event countdown widgets. Live Days/Hours/Mins/Secs countdown, theme styling, embeddable HTML snippet.

Moon phases for any month/year. Synodic period calculation. Moon emojis. Next full/new moon dates. Monthly calendar grid view.

Convert any date to 15+ formats including ISO 8601, RFC 2822, Unix timestamp, and locale-specific formats (US, UK, Japan). Shows day of week, week number, and day of year.

Live countdown to your next birthday with days, hours, minutes, seconds. Shows your exact age, zodiac sign, birthstone, birth day of week, and fun facts about your birth year.

Create custom event countdowns with live days, hours, minutes, seconds display. Multiple simultaneous countdowns. Preset events: New Year, Christmas, Halloween. Color-coded. Saved locally.

Calculate sunrise, sunset, golden hour, twilight times, and day length for any global city or latitude/longitude coordinates.

Calculate optimal sleep schedules and light exposure windows for night shift workers.

Calculate optimal bedtime and wake-up alarm times based on 90-minute REM sleep cycles.

Calculate optimal bedtime and wake-up alarm times based on 90-minute REM sleep cycles and sleep onset latency.

Calculate optimal bedtime and wake-up alarm times based on 90-minute REM sleep cycles.

Calculate optimal sleep & wake times based on 90-minute REM sleep cycles.

Calculate optimal sleep and wake cycles for shift workers. Use shift circadian on Toolzium — no signup, no watermarks, works on any device.

Calculate accumulated sleep debt over a 7-day week and recovery plan. Use sleep debt on Toolzium — no signup, no watermarks, works on any device.

Calculate your Sleep Efficiency Percentage and Quality Score based on time in bed and actual time asleep.

Calculate your sleep efficiency percentage, score, and get recommendations for better sleep hygiene.

Sleep latency & sleep efficiency analyzer with custom alarm calculator.

Calculate optimal bedtimes based on sleep latency and 90-minute REM sleep cycles.

Log and analyze daily sleep patterns, calculate average sleep duration, and track sleep consistency.

Calculate optimal bedtime and wake-up times accounting for personal sleep latency and 90-minute REM cycles.

Create digital time capsule messages locked until a future date. Use time capsule on Toolzium — no signup, no watermarks, works on any device.