Which one of the following countries has the maximum time difference from Greenwich Mean Time (GMT) ?

The time difference from Greenwich Mean Time (GMT) is determined by a country's UTC offset. Among the given South Asian countries, India and Sri Lanka both follow Indian Standard Time (IST), which is UTC+5:30, or 5 hours and 30 minutes ahead of GMT. Nepal follows Nepal Time (NPT), which is UTC+5:45, placing it 5 hours and 45 minutes ahead of GMT. Bhutan follows Bhutan Time (BTT), which is UTC+6:00, making it 6 hours ahead of GMT. Since Bhutan's offset of +6:00 is the largest numerical value compared to India (+5:30), Sri Lanka (+5:30), and Nepal (+5:45), it has the maximum time difference from GMT among the options provided. Most countries adopt standard times based on central meridians to suit administrative needs [2].

Sources

1. [2] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 18: Latitudes and Longitudes > Standard Time and Time Zones > p. 243