Is my data sent to a server?

No. Every calculation runs in your browser with JavaScript. Nothing is uploaded or stored.

How do I convert hours and minutes to decimal hours?

Divide the minutes by 60 and add them to the hours. The Timesheet tab shows the decimal value automatically for each row.

Hours Calculator — Exact Time Between Two Dates & Times (Free)

Q: Does the hours calculator count weekends?

The Time Difference tab counts pure elapsed time and includes weekends. Use the Working Days tab if you need to exclude Saturdays and Sundays.

Q: Can it handle times that cross midnight?

Yes. Set the end date to the following day. For example, 10 PM Tuesday to 6 AM Wednesday gives exactly 8 hours.

Q: Does it account for daylight saving time?

The calculator uses your device's local time zone, so if a daylight saving change falls inside your date range, the elapsed clock time is still correct but the wall-clock difference may differ by one hour.

Pick a start and end moment. Handles different days, crossing midnight, and long gaps of months or years.

Start

End

Count only working hours (Mon–Fri, 09:00–17:00)

Total Duration

—

0Days

0Hours

0Minutes

0Seconds

Total hours0

Total minutes0

Total seconds0

Decimal hours (for invoices)0

Full days0

Add a row for each shift. Breaks are entered in minutes and subtracted from that row. Handles overnight shifts when the end time is earlier than the start time.

Hourly rate (optional)

Currency symbol

Total time worked

—

0Days

0Hours

0Minutes

0Shifts

Total hours (decimal)0

Total minutes0

Estimated pay0

Start from a moment in time and add or subtract a duration. Useful for scheduling, deadlines and "what time will it be in 90 minutes".

Starting moment

Duration

Days

Hrs

Min

Sec

Operation

Resulting moment

—

Full date & time—

Day of the week—

Time elapsed from start—

Counts business days between two dates, excluding weekends and any public holidays you add.

From

Include the start date in the count

Public holidays (one per line, format YYYY-MM-DD)

Working days

—

Calendar days0

Weekend days0

Holidays on weekdays0

Working days0

Working weeks (approx.)0

What this calculator actually does

You give it two moments in time — say Monday 9:00 AM and Friday 5:30 PM — and it tells you the exact gap between them. Not "about four days" or "roughly a hundred hours", but the precise number of days, hours, minutes and seconds, plus the raw totals if you need those instead.

Most online calculators either can't handle time of day, or they give you a weird decimal like "104.5 hours" and leave it there. This one shows both: the human version and the number you'd put on an invoice. Four tabs cover the four jobs people actually need — measuring a gap, totalling a timesheet, doing duration maths, and counting working days.

How to use each tab

Time Difference

Pick the start date and start time in the left box.

Pick the end date and end time in the right box.

If you only need working hours, tick the box for Mon–Fri, 09:00–17:00.

Press Calculate and read the breakdown below.

Timesheet Total

Each row takes a start time, an end time and a break in minutes. Rows where the end is earlier than the start are treated as overnight shifts and 24 hours are added automatically. The panel shows the grand total as days, hours and minutes, plus a decimal figure ready for invoicing. If you enter an hourly rate, it also estimates pay.

Add / Subtract

Pick a starting moment and enter a duration in days, hours, minutes and seconds. Choose whether to add or subtract. Useful for things like "what time is it ninety minutes from now" or "what's the date 45 days before the deadline".

Working Days

Counts business days between two dates, skipping Saturdays and Sundays. Add your public holidays — one per line in YYYY-MM-DD format — and they'll be excluded too. Weekends that fall on a holiday are not double counted.

💡 Pro tip: Want to know how many hours between 9 AM and 5 PM today? Set both dates to today. The calculator doesn't care about the date if it's the same one on both sides.

Who actually uses a tool like this

More people than you would guess. Here is what the four tabs get used for every day:

💼

Freelancers billing hours

Turn a week of client work into an exact decimal figure for the invoice, with breaks already deducted.

🛫

Travel and flight planning

See the real elapsed time between departure and arrival, including long layovers.

🎓

Study and deadlines

Know exactly how many working days remain before a submission, without counting weekends by hand.

🏃

Event countdowns

How many hours until the wedding, the launch or the big match? Now you know precisely.

💻

Developers and shift workers

Measuring uptime windows, shift lengths and gaps between two log timestamps.

🏋️

Fitness and sleep tracking

How long was the workout? How many hours did you actually sleep? Real numbers instead of guesses.

The maths behind it (it really is simple)

Every date and time on a computer is stored as a single number — the count of milliseconds since 1 January 1970. That is called a Unix timestamp, and it is how almost every device in the world keeps track of time.

So when you enter two dates, this calculator does three things:

Converts both moments to their timestamp number.
Subtracts the start from the end to get the difference in milliseconds.
Divides that difference into days, hours, minutes and seconds so it is readable.

That is the whole trick. No rounding, no approximation. The number you see is the exact gap.

Converting to decimal hours

Take the minutes, divide by 60, and add them to the hours. So 7 hours 45 minutes becomes 7 + (45 ÷ 60) = 7.75. The Timesheet tab does this for every row automatically, because that is the form most invoicing systems expect.

⚠️ One thing to know about time zones: the calculator uses your device's local time zone. If you are comparing moments in two different zones — for example a call between Karachi and New York — use the Time Zone Converter instead, which handles the offset for you.

Your privacy and how we handle data

Your times never leave your device. Every calculation runs as JavaScript in your browser. Nothing you type into the date or time fields is uploaded, stored or logged anywhere. There is no server processing your input.

Nothing is saved between visits. Refresh the page and the fields reset. We do not use localStorage, sessionStorage or cookies to remember your entries.

Cookies and advertising. Advertising and analytics cookies are switched off by default. They only turn on if you press Accept all, or if you choose them individually in Manage preferences. You can change your mind at any time from the Cookie Policy page. Full details are in our Privacy Policy.

About the author

Khalil Rahman — Front-end developer and tool builder

Khalil has spent the last eight years building browser-based utilities for freelancers, designers and developers. He built this calculator after losing count one too many times while invoicing hourly work, and he maintains the SkillsInsider time and productivity toolset.

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Frequently asked questions

Does the hours calculator count weekends or holidays?

The Time Difference tab counts pure elapsed time, so weekends and holidays are included. If you need to exclude them, use the Working Days tab — tick the option to include or exclude the start date and paste in any public holidays you want removed.

Can it handle times that cross midnight?

Yes. Set the end date to the following day. For example, comparing 10 PM on Tuesday to 6 AM on Wednesday gives exactly 8 hours. In the Timesheet tab, if the end time is earlier than the start time, the row is automatically treated as an overnight shift.

What happens if the end is before the start?

The calculator shows the duration with a minus sign in front. That usually means the start and end were swapped — just flip them and try again.

How do I convert the result to decimal hours for an invoice?

The decimal figure is shown in the totals box automatically for both the Time Difference and Timesheet tabs. The formula is hours + (minutes ÷ 60), so 7 hours 30 minutes becomes 7.5.

Why is the "total hours" number sometimes much bigger than the breakdown?

Because it counts every hour rather than just the leftover after whole days are broken out. A three-day gap shows "3 days, 0 hours" in the breakdown, but "72 hours" in the totals — the same amount expressed two different ways.

Does it account for daylight saving time?

The calculator uses your device's local time zone. If a daylight saving change falls inside the range you are measuring, the elapsed clock time is still correct, but the wall-clock difference across the change may be one hour more or less than a naive subtraction would suggest.

Is my data sent anywhere?

No. Every calculation runs in your browser using JavaScript. Nothing gets uploaded, stored, tracked or shared. Close the tab and it is gone.

Can I use this for payroll?

It gives you accurate elapsed-time totals and decimal hours, which is what most payroll systems need. However, always check your local employment rules — overtime multipliers, statutory breaks and rounding conventions vary, and this tool does not apply any of those automatically.

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