---
title: "Time Calculator — Hours Between Times, Add/Subtract Hours"
description: "Calculate hours and minutes between two times. Add or subtract hours from a time. Works with 12-hour (AM/PM) and 24-hour formats. Perfect for work hours, shift calculations."
url: "https://worldcalculators.org/calculators/time-calculator/"
canonical: "https://worldcalculators.org/calculators/time-calculator/"
---

# Time Calculator

Calculate hours and minutes between two times. Add or subtract hours from a time. Works with 12-hour (AM/PM) and 24-hour formats. Perfect for work hours, shift calculations.

## Quick answer

Hours between two times = end − start; if the end is earlier, add 24 hours for an overnight shift. 9:00 AM to 5:00 PM = 8 hours, and 10:00 PM to 6:00 AM = 8 hours across midnight. Most countries log shifts on a 24-hour clock, while the US and UK commonly use 12-hour AM/PM.

## Common Work Schedule Calculations

Legal maximum weekly hours vary significantly:

Source: https://worldcalculators.org/calculators/time-calculator/
Markdown mirror of the HTML page. Prefer this URL for RAG; the interactive calculator still lives on the HTML page.