Time Add Subtract ماشین‌حساب

از Time Add Subtract ماشین‌حساب برای دریافت نتایج سریع و دقیق استفاده کنید.

نحوه استفاده از این ماشین حساب

Start Time را وارد کنید
Operation را وارد کنید
Hours را وارد کنید
Minutes را وارد کنید
روی دکمه محاسبه کلیک کنید
نتیجه نمایش داده شده در زیر ماشین حساب را بخوانید

How to Add and Subtract Time

Adding or subtracting time requires working in a base-60 system for minutes and a base-24 system for hours. Unlike regular arithmetic, 75 minutes becomes 1 hour 15 minutes, and adding 3 hours to 22:00 wraps around to 01:00 the next day.

This calculator handles all wrapping automatically — so adding 5 hours to 22:30 correctly gives 03:30, not 27:30.

Common Use Cases for Time Calculation

Time addition and subtraction is useful for: scheduling meetings across time zones, calculating shift end times, figuring out arrival times, meal planning and cooking timers, and sports timing.

For example, if a flight departs at 14:45 and takes 7h 20m, it arrives at 22:05. Or if your shift starts at 07:00 and lasts 8.5 hours, it ends at 15:30.

24-Hour vs 12-Hour Time Format

This calculator uses 24-hour (military) time format. To convert: PM hours add 12 (3:00 PM = 15:00). 12:00 PM = 12:00. 12:00 AM = 00:00. Midnight wraps from 23:59 to 00:00.

For crossing midnight, the result will correctly wrap to the early hours of the next day.

Frequently Asked Questions

What is 3:45 PM plus 2 hours 30 minutes?

3:45 PM (15:45) + 2h 30m = 18:15 (6:15 PM). Enter 15:45 as start time, select add, hours=2, minutes=30.

What happens when time crosses midnight?

The calculator wraps around automatically. Adding 4 hours to 22:00 gives 02:00 (next day). The date change is indicated in the result.

Can I subtract time to find start time?

Yes — select 'subtract' to work backwards. If you need to be somewhere at 09:30 and the journey takes 45 minutes, subtract 45 minutes to find you need to leave at 08:45.

آخرین به‌روزرسانی: March 2026