The Time Zone Duration Calculator finds the exact duration between a point in time in one location and a different point in time in a different location.

Getting Started with Your Calculation

  1. Choose your Start Location and End Location either by using the search fields or the suggestions below them.
  2. Enter the Start Date and End Date, including a time of day for each.
    • For the dates, you can use the input fields, click on the calendar icon to select your date, or click on the Today link to get today's date.
    • For the time of day, use the input fields, click on Now to use the current time of day, on Start of Day for midnight (00:00 or 12:00 am), or on Noon for midday (12:00 or 12:00 pm).
  3. Then click Calculate Duration to get your result.

Additional Options

Remove the time zone conversion

Clicking Remove the time zone conversion takes you to the Time Duration Calculator where you can calculate a time span without crossing time zone boundaries.

FAQ: Troubleshooting

Why are the years and months wrong?

The calculator adds or subtracts the larger time units before the smaller time units. This means that it adds years, then months, then days. Although the total number of days in January (31) and February (28) are different, both are counted as 1 month. In some cases, this method can lead to unexpected results.

For example, in a common year, the time span between January 28 and March 1 is calculated as 1 month and 1 day (January 28 + 1 month = February 28; February 28 + 1 day = March 1).

However, the time span between January 31 and March 1 is also shown as 1 month and 1 day. The calculator first adds 1 month to jump from January to February. But since February only has 28 days in a common year, it lands on February 28 before adding 1 day to arrive at March 1.

This may seem illogical at first, but the structure of our calendar means that there is no perfect way of calculating dates including months and years.

Does the calculator include Daylight Saving Time (DST)?

The calculator takes into account the DST switches in the locations you enter.

Does the calculator include leap years?

Yes, all our calculators account for leap years.

Why are the date fields in the wrong order?

You can change the order of the Day, Month, and Year fields by selecting a different Short Date format in My Units.

Can I edit my calculation?

To edit your calculation, scroll up to the top of the page, make your changes, and calculate again. The Make adjustment and calculate again is a shortcut to the top of the page.

Why does the result show the wrong days of the week?

This is most likely not an error but due to the fact that the Julian calendar was still in use in the year you entered. This calendar system was eventually replaced by today's Gregorian calendar, but the date this change happened differed from one country to another.

The calculator uses the Julian-Gregorian switch date of the country you select in the settings under My Units.

Can I remove holidays and weekends?

Not in this calculator, but the Business Days Calculator lets you exclude different days, like weekends and public holidays.

How does your algorithm work? Can you help me program my own?

We are a small team with a very extensive website to manage, so unfortunately, we do not have the capacity to share detailed information about our algorithms or provide programming help.

What kinds of date calculators do you offer?

  1. Calculating the duration between 2 points in time:
  2. Adding or subtracting days:

Where can I find more information about the site and its services?

The General FAQ Page answers your questions about, our services, site-wide settings and customization options, as well as advertising and copyright policies.


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