A few practical standards to help you settle in quickly once you arrive.
Time and measurements
Bhutan observes a single time zone, Bhutan Time (BTT), which is UTC+6 — half an hour ahead of India, one hour behind Thailand, and two hours behind China despite the shared northern border. There is no daylight saving. The country uses the metric system throughout, so distances are in kilometres, weights in kilograms and temperatures in degrees Celsius.
Electricity and charging
Mains power is 230 volts, 50 Hz. Sockets are mostly the Indian-style round-pin types (D, F and G), and many hotels also have European-style two-pin outlets, so a universal travel adapter is the safest bet. Electricity in Bhutan is almost entirely clean hydropower and is generally reliable in the towns, though brief outages can happen, especially during summer storms and in remote areas. On treks and long drives there is no mains power for hours at a time, so a power bank is invaluable for keeping phones and cameras charged.