⏱️ Time Duration

What is Time Duration?

The Time Duration Calculator measures the span between two clock times and returns it as hours:minutes:seconds plus decimal hours and decimal minutes. When the end time is earlier than the start time, it is treated as the next day, so an overnight span such as 10:00 PM to 6:00 AM counts as 8 hours instead of a negative value. A one-click toggle makes the end time follow the current clock for a live count-up, and every calculation runs locally in your browser.

How to Use Time Duration

1. Enter a start time and an end time (24-hour values work fine)
2. Choose how overnight spans are handled — Auto suits most cases
3. Read the hh:mm:ss duration plus decimal hours and decimal minutes

Why Use Our Time Duration?

• Automatic midnight handling — an end time earlier than the start counts into the next day
• Duration shown as hh:mm:ss, decimal hours and decimal minutes
• Choose Auto, Always next day or Same day to match your working style
• Live end-now toggle for a real-time count-up from any start time

Common Use Cases

• Working out how long a shift or commute that crosses midnight lasts
• Adding up time between two clock times for tasks or travel
• Getting a decimal-hours figure for timesheets and billing

Frequently Asked Questions

• What happens if the end time is after midnight?▾
  If the end time is earlier than the start time, the tool treats it as the next day automatically. For example, 10:00 PM to 6:00 AM is 8 hours, and a note under the result confirms the end lands on the next day.
• Does it work with 12-hour and 24-hour clocks?▾
  Yes. The time fields accept 24-hour values such as 14:30 or 18:00, and the result note shows the same times in 12-hour AM/PM form so the span is easy to read.
• Can I compare dates too?▾
  This tool compares two times of day with automatic overnight handling. For full date ranges use the days-between-dates-calculator, which counts days, weeks, workdays and months between any two dates.