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5 is the difference in hours of edt and gmt (grenwich mean time)
thus mine is set tz=cst6cdt - hope that helps !!
The line in ur autoexec.bat file must read:
SET TZ=EST5EDT
73
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AMATEUR RADIO STATION NO0C
Tim L. Andersen "If you come to a fork in the road,
15 LaPlatte Road take it" - Yogi Berra
Kearney, NE 68847-4802 NO0C@WA0PXW.#SCNE.NE.USA.NA
U.S.A. ARRL DXCC Mixed and SSB Honor Roll
QSL Mgr for BV4CT 322 Total / 318 Current / 317 SSB
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First: the "5" is the number of hours offset from Coordinated Universal
Time.
Second: you sure that command didn't have "SET " on the front?
Third: some program, probably part of the email package, is looking
at this parameter to make appropriate adjustments.