DST Daylight saving time, Salt Lake, Solar Calendar e.g. Roman Julian, Chronicle i.e. Memorial, IQ 3G | Seiko Quartz years – Spiritual
GMT Greenwich mean time, Rare Earth, Lunisolar Calendar e.g. Chinese Gregorian, Seasonal i.e. Weather, CQ 4G | Omega Automatic months – Remark
UTC Universal time coordinated, Organic, Lunar Calendar e.g. Islamic Babylonian, Event i.e. Harvest, EQ 5G | Rolex Oyster weeks – Perpetual
ET Electronics time, Circuit, Galactic Calendar e.g. Mayan Star war, Location i.e. Localised, AQ 6G | Casio Circuit days- Junction
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