The best replacement for gmt time is est.

The best alternatives to gmt time are rated as following:
★★★★★  est
★★  pst
★★  utc
★  est time
★  ist
  cet
  utc time
  et time

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Speaking about gmt time, one probably shouldn't forget about ist.

Other search terms related to gmt time and their ratings are:
★★★★★ ist
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gmt time
est
pst