Time & Date Calculators — Duration, Business Days, Countdown & More

Plan trips, schedule events, track work hours, and calculate deadlines with our free time and date tools. Simplify every time-related task with instant, accurate results.

All Time & Date Calculators

⏱️

Time Calculator

Add or subtract hours, minutes, and seconds from any time. Convert to decimal hours, calculate durations, and handle midnight crossings automatically.

★★★★★

⏳

Time Duration Calculator

Calculate the exact duration between two times. Shows hours, minutes, seconds, and total minutes — handles overnight spans.

★★★★★

🕑

Time Card Calculator

Track work hours with clock in/out times and break deductions. Get net hours worked in both standard and decimal format.

★★★★★

📋

Work Hours Calculator

Add up your weekly work hours with this time sheet calculator. Enter start time, end time, and breaks for each day. See total hours in decimal format with FLSA overtime and optional gross pay calculation.

★★★★★

🕐

Hours Calculator

Calculate the total number of hours and minutes between two date-times. Perfect for tracking project hours and event durations.

★★★★☆

🎖️

Military Time Converter

Convert between 12-hour (AM/PM) and 24-hour (military) time format. Instant, accurate conversions for any time of day.

★★★★★

📖

Reading Time Calculator

Estimate how long it takes to read any text. Get reading and speaking times based on average word-per-minute rates.

★★★★☆

⏩

Playback Speed Calculator

See how much time you save at different playback speeds. Compare 1×, 1.25×, 1.5×, 2× and more for podcasts, videos, and audiobooks.

★★★★☆

📅

Date Calculator

Add or subtract days, weeks, months, and years from any date. Find future or past dates with a single click.

★★★★★

📆

Date Duration Calculator

Calculate the exact duration between two dates in years, months, days, and total weeks. Perfect for tracking timelines and age differences.

★★★★★

💼

Business Days Calculator

Count working days between two dates, excluding weekends. Essential for project planning, SLAs, and delivery timelines.

★★★★★

🎯

Days Until Calculator

Countdown to any future date. See days, weeks, months, and hours remaining until your target date arrives.

★★★★★

🎂

Birth Year Calculator

Find the birth year from a person's current age. Shows both possible birth years depending on whether their birthday has passed.

★★★★☆

📊

Days Left in the Year Calculator

See how many days are left in the current year. Track year progress with days passed, percentage complete, and weeks remaining.

★★★★☆

🗓️

Deadline Calculator

Calculate a deadline from a start date and lead time. Shows both calendar-day and business-day deadlines for project planning.

★★★★☆

📋

Week Calculator

Find the ISO week number of any date. See the start and end of the week, day of the year, and more.

★★★★☆

💡 Why Time & Date Calculators Matter

Time is the one resource you cannot buy, borrow, or store — making accurate time management the highest-leverage skill in business and life. These calculators eliminate mental math and human error from scheduling, project planning, and deadline tracking.

From counting business days for SLA compliance to converting military time for global coordination, every tool is designed for instant, zero-friction results. No formulas to remember, no spreadsheets to maintain.

Pro tip: The Business Days Calculator is invaluable for contracts and SLAs. A '30-day' delivery window actually means ~22 business days — missing this distinction is one of the most common project planning mistakes.