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

Q: How do I calculate the number of days between two dates?

Use our Date Duration Calculator. Enter the start date and end date, and it instantly shows the difference in years, months, days, total weeks, and total days. It handles month-length variations and leap years automatically.

Q: What is the difference between calendar days and business days?

Calendar days include every day (Monday through Sunday). Business days exclude weekends (Saturday and Sunday) and optionally holidays. A 14-calendar-day window contains only 10 business days. Always clarify which type is meant in contracts and deadlines.

Q: How does military time work?

Military (24-hour) time runs from 0000 (midnight) to 2359 (11:59 PM). To convert PM times: add 12 to the hour (3:00 PM = 1500). To convert from military: if the hour is 13 or above, subtract 12 and add PM. Our converter handles this instantly.

Q: What is the average reading speed?

The average adult reads at approximately 238 words per minute (wpm) for non-fiction and 260 wpm for fiction. Speed readers can reach 500–700 wpm. Our Reading Time Calculator lets you adjust the WPM to match your personal reading speed.

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

📅

Days From Today Calculator

Find the exact date any number of days from today. Get calendar-day and business-day results with US deadline context.

★★★★★

⏱️

Countdown Timer

Live countdown to any date and time. Count down days, hours, minutes, and seconds to holidays, events, and deadlines.

★★★★★

⏱️

Online Timer

Set a countdown timer with hours, minutes, and seconds. Get an alert when time is up — preset timers included.

★★★★★

⏱

Online Stopwatch

Centisecond-precision stopwatch with lap split tracking. Start, stop, lap, and reset in your browser.

★★★★★

🎂

Birthday Countdown

How many days until your birthday? Live countdown to your next birthday with milestone age references.

★★★★★

💍

Wedding Countdown

Count down to your wedding day with a planning timeline, budget breakdown, and vendor booking deadlines.

★★★★★

🏫

School Countdown

Days until the end of school or back to school. Regional US start and end dates by state.

★★★★★

📆

Weeks From Today

Find the exact date any number of weeks from today. 1–52 week reference table.

★★★★★

🗓️

Months From Today

Find the exact date any number of months from today. 1–24 month reference.

★★★★★

🕐

Hours From Now

What time will it be X hours from now? 1–72 hour reference table.

★★★★★

⏰

Minutes From Now

What time will it be X minutes from now? 5–120 minute reference.

★★★★★

📋

Today's Date

Current date in multiple formats with day number, week number, and year progress.

★★★★★

🕐

Digital Clock

Live online clock with seconds, 12/24-hour formats, and auto timezone detection.

★★★★★

📊

Day of the Year

What day number is it? Progress bar and month-by-day reference table.

★★★★★

📈

Week of the Year

Current ISO week number with quarterly reference table and year progress.

★★★★★

🗓

What Month Is It?

Current month with birthstones, flowers, seasons, and months-of-the-year reference.

★★★★★

⏳

Weeks Left in Year

How many weeks remain in the year? Progress bar and upcoming milestones.

★★★★★

🔄

Time Converter

Convert hours, minutes, seconds, days & weeks. 12 conversion tools with reference tables.

★★★★★

⏱️

Time Calculator — Add & Subtract Hours, Minutes

Add or subtract hours, minutes, and seconds from any time. Convert results to decimal hours for payroll and project tracking.

★★★★★

⏳

Time Duration Calculator — Hours Between Two Times

Calculate exact elapsed time between two clock times. Shows hours, minutes, and seconds — handles overnight spans automatically.

★★★★★

🕑

Time Card Calculator — Track Clock In & Out Hours

Enter clock-in and clock-out times with breaks to calculate net work hours. Export results in standard or decimal format.

★★★★★

📋

Work Hours Calculator — Weekly Timesheet & Overtime

Add daily start/end times and breaks for a full week. Calculates total hours, FLSA overtime, and optional gross pay.

★★★★★

🕐

Hours Calculator — Total Hours Between Two Dates

Count the total hours and minutes between any two date-times. Ideal for project duration, event planning, and billing.

★★★★☆

🎖️

Military Time Converter — 12h to 24h & Back

Convert any time between 12-hour AM/PM and 24-hour military format. Includes a full conversion chart for quick reference.

★★★★★

📖

Reading Time Calculator — Estimate Read Duration

Paste text or enter a word count to estimate reading and speaking time. Adjustable WPM for speed readers and presentations.

★★★★☆

⏩

Playback Speed Calculator — Time Saved at 2×

See exactly how much time you save watching videos or podcasts at 1.25×, 1.5×, or 2× speed. Compare durations side by side.

★★★★☆

📅

Date Calculator — Add Days, Weeks & Months

Add or subtract days, weeks, months, or years from any date. Find exact future or past dates for deadlines and planning.

★★★★★

📆

Date Duration Calculator — Days Between Dates

Find the exact difference between two dates in years, months, weeks, and days. Useful for age gaps, contracts, and timelines.

★★★★★

💼

Business Days Calculator — Count Working Days

Count weekdays between two dates, excluding weekends. Essential for SLA tracking, shipping estimates, and project deadlines.

★★★★★

🎯

Days Until Calculator — Countdown to Any Date

Enter a future date to see the days, weeks, and months remaining. Live countdown for events, deadlines, and milestones.

★★★★★

🎂

Birth Year Calculator — Find Year Born From Age

Enter a person's current age to find their birth year. Shows both possible years based on whether their birthday has passed.

★★★★☆

📊

Days Left in the Year — Year Progress Tracker

See how many days remain in the current year. Includes days elapsed, year percentage, and weeks remaining for goal tracking.

★★★★☆

🗓️

Deadline Calculator — Due Date From Lead Time

Set a start date and lead time to calculate the deadline. Shows both calendar-day and business-day results for project planning.

★★★★☆

📋

Week Calculator — ISO Week Number Lookup

Find the ISO week number for any date. See week start/end dates, day of year, and quarter for business and payroll planning.

★★★★☆

💡 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.