Error in startup script: bad switch "-f", must be -format, -gmt, -locale or -timezone
    while executing
"clock format [clock scan "$clockOption"] -gmt true -f "%Y-%m-%d %T""
    (procedure "GetCurrentTimeStamp" line 2)
    invoked from within
"GetCurrentTimeStamp"
    (procedure "UpdateClock" line 3)
    invoked from within
"UpdateClock"
    invoked from within
"if {$GMTCLOCK } {
    set gmtClock [label $topFrame.gmtClock -text "YYYY-MM-DD HH:MM:SS GMT" -relief groove]
    pack $gmtClock -side right -anchor e ..."
    (file "./sguil.tk" line 1826)