Technical information

Chapter 2: AT+i Commands Reference
May 31, 2008 AT+i Commands Reference Manual 2-141
+iGMTO - Define Greenwich Mean Time Offset
+iDSTD - Define Daylight Savings Transition Rule
Syntax: AT+iGMTO=n
Permanently sets W24 location's Greenwich mean time offset, in
hours.
Parameters: n = -12..12
Default: 0
Result Code:
I/OK
AT +i G MT O~n Temporarily set the Greenwich Mean Time Offset to value n. The
permanent values will be restored after completing the next
session, whether the session was successful or not.
AT+iGMTO? Report the current value of GMTO. The reply is followed by
I/OK.
AT+iGMTO=? Returns the message '-12-+12'. The reply is followed by I/OK.
Syntax: AT+iDSTD=DST_rule
Permanently sets the daylight savings time transition rule.
Parameters: DST_rule ::= "<HH1.DD1.MM1>;<HH2.DD2.MM2>"
Where,
<HH1.DD1.MM1> indicates the date when Daylight Saving
Time starts and <HH2.DD2.MM2> indicates the date when
Daylight Saving Time ends.
HHn ::= Full Hour (two digits).
DDn ::= Either specific day, or <F/L><Day of Week>.
<F/L> ::= F = First, L = Last Day of the month.
For example: FSun indicates the First Sunday of the month.
<Day of Week> ::= {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri",
"Sat"}.
MMn ::= Month.
Command Options:
DST_rule='' Empty - no Daylight Saving Time definition is applied.
DST_rule=<dst> Daylight Savings rule defined in dst will be applied to the time
retrieved from the Time Server when reporting the current time.
Default: Empty. No Daylight Saving Time is applied.
Result Code:
I/OK