The same Time Zone is active in all cities like Lahore,Karachi,Islamabad. Since 1 January 1906 PST was same as IST(Indian Standard Time) but just after Independence of Pakistan in 1947 From Midnight of 30 April and 1 May, 1954 Pakistan Standard Time become effective. Now this is an current Pakistan Time since 1954. It is 5 hours ahead of GMT/UTC (UTC+05:00) as shows through below given exact Time of Pakistan.
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Pakistan Standard Time
Time Zone = GMT+5
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Pakistan Time Zone
Pakistan Standard Time is 5 hours ahead GMT.
Pakistan Standard Time remains same whole the year in both winter and summer Season.