Bodet NTP Mode D'emploi page 35

Summer to Winter time = last Sunday in October at 1am UTC (that is 4am local time).
East USA Zone "mode_usae" (New York, Toronto, etc).
Winter to summer time = second Sunday of March at 2am local time.
Summer to Winter time = first Sunday of November at 2am local time.
Central USA Zone "mode_usac" (Chicago).
Winter to summer time = second Sunday of March at 2am local time.
Summer to Winter time = first Sunday of November at 2am local time.
Mountain USA Zone "mode_usam" (Denver).
Winter to summer time = second Sunday of March at 2am local time.
Summer to Winter time = first Sunday of November at 2am local time.
Pacific USA Zone "mode_usap" (Los Angeles).
Winter to summer time = second Sunday of March at 2am local time.
Summer to Winter time = first Sunday of November at 2am local time.
Australia Zone "mode_aus" (Sydney).
Winter to summer time = first Sunday of October at 2am local time.
Summer to Winter time = first Sunday of April at 3am local time.
Without seasonal change "mode_gmt".
No summer/winter changeover.
The GMT function imposes an offset between the time received in
coded time (NTP message) and the time displayed.
Validate this option with the [SEL] button.
Menu only operational for NTP models.
Setting the offset in GMT mode
The offset can be adjusted by pressing [+]. The value to be chosen is
between -12 h 30 and +12 h 30 by increments of 0 h 30.
The time displayed = GMT + or - x hours.
N.B. : for independent clocks (without external synchronisation),
this adjustment is inactive. The time is adjusted only via the time setting menu and the
geographic zone selection.
A independent clock in GMT zone = no seasonal changeover.
A independent clock in xx zone = seasonal changeover according to the zone.
Seasonal change programmable on "mode_prg"
This menu enables you to programme the dates of summer/winter time
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