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Time Zone Planner

Converts a time between two UTC offsets and shows the overlapping working hours for scheduling a meeting.

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Enter your figures and press Calculate.
In short Time Zone Planner is a free online tool on inputtesthub.com that converts a time between two UTC offsets and shows the overlapping working hours for scheduling a meeting. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.

How to use the Time Zone Planner

  1. Enter your figures in the input fields.
  2. The result updates as you type, together with the full working.
  3. Check the breakdown table to see exactly how the number was reached.

About the Time Zone Planner

The Time Zone Planner converts a time between two UTC offsets and shows the overlapping working hours for scheduling a meeting. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.

What people use it for

  • Scheduling a call across continents.
  • Finding when a remote team’s day overlaps yours.
  • Checking whether a deadline lands the previous day somewhere.

Details

KarachiUTC+5
DelhiUTC+5.5
LondonUTC+0
New YorkUTC−5
TokyoUTC+9

The maths behind it

This tool uses Their time = your time + (their offset − your offset), wrapping across midnight. Working overlap compares two 09:00–17:00 days. Every intermediate value is shown on screen, so the result can be checked by hand.

These are fixed UTC offsets and take no account of daylight saving. About a third of the world moves its clocks and they do not all switch on the same date, so for a few weeks each spring and autumn the real difference is an hour off. Confirm against a live clock for the actual date.

Frequently asked questions

Are there any usage caps on the Time Zone Planner?
There is no cost and no cap. The Time Zone Planner is not a demo of a paid product, so nothing is held back or watermarked.
Can you see what I put into this utility?
No. The Time Zone Planner runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
What formula does the Time Zone Planner use?
It uses Their time = your time + (their offset − your offset), wrapping across midnight. Working overlap compares two 09:00–17:00 days. The full working is printed under the result, so you can follow every step rather than trusting a black box.
What do people use the Time Zone Planner for most?
Typical uses: scheduling a call across continents. Finding when a remote team’s day overlaps yours. Checking whether a deadline lands the previous day somewhere. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
These are fixed UTC offsets and take no account of daylight saving. About a third of the world moves its clocks and they do not all switch on the same date, so for a few weeks each spring and autumn the real difference is an hour off. Confirm against a live clock for the actual date.
Which values should I know?
Karachi is UTC+5. Delhi is UTC+5.5. London is UTC+0. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.

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