Time Duration Calculator

The Formula

Calculate the exact elapsed time between two dates and times. The duration is computed by subtracting the start date-time from the end date-time, automatically handling same-day durations, multi-day spans, and overnight shifts. Results are displayed in multiple formats for flexibility: total hours, D:H:M (days:hours:minutes), and W:D:H (weeks:days:hours).

Variable Definitions

How to Use This Calculator

1. 1

   Select the start and end dates using the date pickers.

2. 2

   Enter the start and end times in either 12-hour (9:00 AM) or 24-hour (14:30) format.

3. 3

   Toggle "Business Days Only" to count only weekdays (Monday-Friday), excluding weekends from the total.

4. 4

   View the duration in multiple formats: total decimal hours, D:H:M format, and W:D:H format for longer spans.

Duration is the exact elapsed time between two dates and times, expressed in hours, D:H:M, or W:D:H format.

Understanding the Concept

This calculator computes the exact time difference between two dates and times, handling same-day durations, multi-day spans, and overnight shifts automatically. The business days mode excludes weekends, making it useful for project management timelines, payroll hours calculation, and scheduling applications that only operate on weekdays. Unlike the Day Counter which counts full calendar days, this calculator returns precise hours, minutes, and seconds between two specific moments in time.

Frequently Asked Questions

Sources & References