I thought it was Greenwich mean time (GMT). I know UTC and GMT is about the same but technically speaking GMT is what you want, that's what haypi uses in all of the letters at least.
Your correct to say GMT as Greenwich Mean Time. Its a Time zone that is consistent throughout the year unaffected by the change of spring and fall time changes. GMT can be synonym-is with UTC as mentioned however UTC is affected by the change of the season where as stated previously GMT is not.
GMT is the universal standard for time keeping world wide and likely the reason that it was used for the Time Zone for reset.
So that translate into this for example: Singapore SGT 500 hours GMT 2100 hours so there is a 16 hour difference.
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so basically youre saying GMT is better to go by, but UTC can be used as an effective (if not 100% accurate) option? I usually go by Zulu time since im in a family with a long military history, so GMT is natural to me as theyre the same thing basically. that's why im usually on top of haypi notices, when they say 6:00 GMT I know exactly what time it is