I've been trying for years (by example) to popularize using PT, MT, CT, ET. Since it's always after a number ("Are you avail at 4ET?") there has never been one instance of confusion, and I save typing and avoid the small but real possibility of being interpreted too literally (suppose someone asks a computer "What time is 4:00 PM EST in London time" during the summer, and gets a 'technically correct' answer).
No, the East Coast observes EDT until November
Many humans write EST in the summer.
I've been trying for years (by example) to popularize using PT, MT, CT, ET. Since it's always after a number ("Are you avail at 4ET?") there has never been one instance of confusion, and I save typing and avoid the small but real possibility of being interpreted too literally (suppose someone asks a computer "What time is 4:00 PM EST in London time" during the summer, and gets a 'technically correct' answer).
I don't have a similar answer for GMT/BST though.
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Then they are wrong.
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I also only use the S variant in human conversation in my time zone.
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EST is valid year-round, if specified.