Time & Date Calculators & World Clock Workbench

Compute exact elapsed years, months, weeks, days, and seconds between two dates.

Count total calendar days, weekend days, and business days between any two dates.

Calculate working days excluding weekends and national public holidays.

Add or subtract days, weeks, or months to determine a future or past date.

Find the ordinal day number (1 to 365/366) and ISO week number for any date.

Determine the exact day of the week (Monday through Sunday) for any historical date.

Sum or subtract hours, minutes, and seconds across multiple timestamps.

Calculate the exact elapsed time duration between start and end times.

Add up columns of time entries for project logs and flight times.

Convert hours and minutes (8h 30m) to decimal hours (8.50h) for payroll.

Convert raw seconds into days, hours, minutes, and seconds.

Calculate gross pay, regular hours, and weekly overtime pay.

Employee shift timesheet tracker with automatic unpaid lunch break deductions.

Track freelance client billable hours, hourly rates, and total invoice totals.

Convert annual salary to hourly, daily, weekly, and bi-weekly pay rates.

Calculate project completion hours based on client budget and target rate.

Live ticking clocks for major international business centers with UTC offsets.

Convert meeting times across EST, PST, GMT, CET, IST, JST, and AEST.

Find optimal golden meeting hours across distributed remote teams.

Plan seamless daily shift handovers for global engineering teams.

Track upcoming Daylight Saving Time spring-forward and fall-back changes.

Calculate exact age in years, months, weeks, days, hours, and minutes.

Convert dog, cat, and bird chronological years to human developmental age.

Track upcoming birthdays, horoscope signs, and days until next birthday.

Find 10,000 days alive, silver/gold anniversaries, and life milestones.

Create custom full-screen visual countdowns for events, holidays, and deadlines.

Boost productivity with customizable 25m work / 5m break interval timers.

Schedule deep work blocks aligned with human cognitive ultradian performance cycles.

Calculate real-time running dollar costs of team meetings based on attendee salaries.

Count exact working days remaining until target retirement date.

Exact solar dawn, sunrise, solar noon, sunset, and twilight times by location.

Real-time interactive 24-hour global map showing day/night solar illumination terminator.

Astronomical dates for Vernal Equinox, Summer Solstice, Autumnal Equinox, and Winter Solstice.

Upcoming total, annular, and partial solar eclipse schedules and visibility paths.

Current moon phase, illumination percentage, age in days, and lunar calendar.

Schedules and astronomical dates for penumbral, partial, and total lunar eclipses.

Predict upcoming Supermoons, Harvest Moons, and monthly lunar phases.

Convert POSIX epoch seconds and milliseconds to human-readable UTC dates.

Calculate astronomical Julian Day Numbers (JDN) and Modified Julian Date (MJD).

Determine leap year status and multi-century leap year calendar rules.

Convert 12-hour AM/PM to 24-hour military and aviation clock syntax.

Calculate project deadline schedules, buffer days, and milestone dates.

Calculate exact remaining working days until target retirement date.

Calculate marathon finish times, km/mile pace splits, and target race times.