Time & Date Suite

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Time Duration Calculator: Time Between Two Dates or Two Times

Calculate duration between two timestamps. Same-day (two times) or multi-day (two dates). Decimal days and hours for payroll. Handles overnight spans and reversed dates.

Configuration

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TIME RESULT

8 Hours, 30 Minutes

Total Days (Decimal): 0.35417

Total Hours (Decimal): 8.50000

Total Minutes: 510

Total Seconds: 30,600

Information Hub

Duration Formula

Duration is the difference between End and Start. In "Between Two Times" mode, if End is earlier than Start (e.g., 11 PM to 7 AM), the calculator adds 24 hours to End so the span crosses midnight.

Total seconds
Decimal hours (payroll)
Decimal days

Duration Between Two Points in Time

Duration is the span between two moments. Same-day intervals use two times (AM/PM); multi-day spans use two full timestamps. The result shows days, hours, minutes, seconds plus decimal forms for payroll and project tracking.

How It Works

Same-Day Span

Enter Start and End times. If End falls before Start (e.g., night shift), the calculator adds 24 hours to End so the span crosses midnight correctly.

Multi-Day Span

Pick Start and End datetimes. The result is days, hours, minutes, and seconds. Useful for project timelines, meeting prep, or any interval spanning midnight or weeks.

Now Button

One click fills the field with the current time or datetime. Reduces data-entry errors when you start or stop a task and need to log the moment.

Decimal Output

Total Days and Total Hours appear as decimals (e.g., 1.75 hours for 1h 45m). Payroll systems often bill in decimal hoursโ€”this matches that format.

Reversed Dates

If Start is after End, the calculator shows the absolute span and notes that the dates were reversed. You still get the right duration without fixing the order.

Point-to-Point

Time is a point (8:30 AM); duration is the distance between two points. This tool measures that distanceโ€”the length of the interval.

Time Duration Calculator: Time Between Two Dates or Two Times

Calculate the exact duration between two timestamps. Same-day (two times) or multi-day (two dates). Decimal days and hours for payroll. Reversed dates handled automatically. Free, runs locally.

How the Time Duration Calculator Works

Duration is the difference between two points in time. The core formula is Durationย (seconds)=โˆฃEndmsโˆ’Startmsโˆฃรท1000\text{Duration (seconds)} = |\text{End}_{\text{ms}} - \text{Start}_{\text{ms}}| \div 1000; from total seconds, we derive days, hours, minutes, and seconds. Decimal forms: Days=secondsรท86,400\text{Days} = \text{seconds} \div 86{,}400 and Hours=secondsรท3,600\text{Hours} = \text{seconds} \div 3{,}600.

Same-Day vs. Multi-Day Mode

  • Between Two Times:
    For intervals on one day (e.g., 9 AM to 5 PM). Enter Start and End with AM/PM. If End is before Start, the tool assumes an overnight span and adds 24 hours to Endโ€”11 PM to 7 AM gives 8 hours.
  • Between Two Dates:
    For spans across days or weeks. Use the datetime pickers. If Start is after End, you still get the correct span; the calculator notes the reversal.

Decimal Hours for Payroll and Billing

Many timesheet systems use decimal hours: 1ย hย 45ย m=1+4560=1.75ย hours1\text{ h }45\text{ m} = 1 + \frac{45}{60} = 1.75\text{ hours}. Billing 1h 45m as 1.45 would underpay; 1.75 is correct. This calculator outputs Total Hours (Decimal) and Total Days (Decimal) so you can verify payroll or project billing.

Time Duration Calculator FAQ

? How do I calculate the time between two times on the same day?

Pick "Between Two Times" and enter Start and End using hour, minute, second, and AM/PM. The duration uses Duration=Endโˆ’Start\text{Duration} = \text{End} - \text{Start} in seconds. If End is earlier than Start (e.g., 11 PM โ†’ 7 AM), the tool treats it as an overnight span and adds 24 hours to End before subtractingโ€”so you get 8 hours, not a negative value.

? How do I find the duration between two dates?

Use "Between Two Dates" and pick Start Date & Time and End Date & Time. The result is the absolute span in days, hours, minutes, and seconds. If you enter Start after End, the calculator still shows the correct duration and mentions that the dates were reversed.

? What does the Now button do?

Now fills that field with the current time (single-day mode) or full date and time (multi-day mode). Handy when you forgot to start a timer or just clocked outโ€”no need to look at a clock and type.

? Why does 11 PM to 7 AM show 8 hours?

End (7 AM) is before Start (11 PM). The calculator assumes an overnight shift: it effectively adds 24 hours to End, so the span is 8 hours. Same logic as a graveyard shift or any interval that crosses midnight.

? What gets copied when I click Copy Result?

Copy Result pastes the full result block: the main duration (e.g., 2 Days, 1 Hour, 1 Minute), Total Days (Decimal), Total Hours (Decimal), Total Minutes, and Total Seconds. Ready to drop into timesheets or reports.
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Time & Date Reference Note

Informational Use: These tools use standard date/time algorithms and your browserโ€™s timezone data (IANA). Results are intended for general reference and planning only.

Verification Recommended: Time zone rules and daylight saving changes vary by region and year. For critical scheduling, payroll, or legal deadlines, confirm results with official sources.

Local Verification: Always confirm times, dates, and business-day counts with official sources or qualified professionals when stakes are high.

ยฉ 2026 CalcRegistry Reference Last Logic Update: FEB 2026Free Online Utility Tools