BIG RED LIGHT. STOP. LOOK BOTH WAYS. PROCEED WITH CAUTION.
Again, saving this text string in table instead of true date is not necessary and opens a huge can of worms.
If you want "GMT" to display with format:
ddd", "dd mmm yyyy hh:nn:ss" GMT"
But if you really, really must save in table, GMT can be included in expression for UPDATE:
Code:UPDATE MyTable SET txtDateString = Format([MyTime], "ddd, dd mmm yyyy hh:nn:ss G\MT")