Time zones are all noted with reference to GMT – Greenwich mean time, which is the time in London.
When someone noted their time zone as GMT+2, that means they are two hours ahead of GMT – when it is 12 o’clock midday in London, it will be 2 o’clock in the afternoon in Switzerland.
India makes it slightly awkward by including a half hour time difference at GMT+5.5, but it works just the same – when it is 12 o’clock midday in London, it will be 5:30 in the evening in India.
To move between different time zones, it may be easiest to convert them both to GMT – so 1 o’clock in Switzerland at GMT+2 is the same as 11 o’clock in London at GMT+0.
11 o’clock in London at GMT+0 will then be equal to 4:30 in India at GMT+5.5.
Once you get used to it you can then shortcut the converting to GMT part by just figuring out the time difference – GMT+5.5 minus GMT+2 means India is +3.5 hours compared to Switzerland, so any time you are given written in GMT+2, you just need to add 3.5 hours to to get the equivalent in your time zone.
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