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Историческую версию GMT Calculator можно получить на Android
Быстро рассчитать время по Гринвичу
A very simple app to calculate the Greenwich Mean Time from any date and time you choose and from any time zone. For example, if you wanted to know what the GMT was at 9:15 pm last Thursday from New York.
Note: I have not taken into account all the different daylight savings adjustments throughout the year - this feature is coming soon. I have also not yet fully tested all time-zone calculations. Let me know if you have any issues. Enjoy.