Etc/GMT is a UTC +00:00 timezone offset where as US/Central is a UTC -5:0 timezone offset. Time difference between Etc/GMT and US/Central is 5:0 hours ie., US/Central time is always 5:0 hours behind ...

Time difference between Etc/GMT and Eastern Standard Time (EST) is 5:0 hours ie., Eastern Standard Time (EST) time is always 5:0 hours behind Etc/GMT. This Etc/GMT to Eastern Standard Time (EST) time ...