Forum TT Soft Sp. z o.o.

To enable this feature, the administrator must configure the
<Daylight Saving Time Rule> (regional) parameter.
This parameter is a rule with 3 fields. Each field is separated by semicolon (;)
as shown below:

start=<start-time>;end=<end-time>;save=<save-time>

where:

<start-time> and < end-time> are of the form: <month>/<day>/<weekday>[/HH:[mm[:ss]]]
<save-time> is of form: [/[+|-]HH:[mm[:ss]]]
<month> = 1,2,3,..,12 (for Jan, Feb, .., Dec)
<day> = [+|-]1,2,3,..,31
<weekday> = 1, 2, 3, .., 7 (for Mon, Tue, .., Sun), or 0 which has special meaning

HH = hour (0-23), mm = minute (0-59), ss = second (0-59)

<start-time> and <end-time> specify the start and end time-date of daylight saving
time and is the amount of hour/min/sec to add to the current time during
daylight saving period. The <save-time> value can be preceded by a negative (-) sign
if subtraction is desired instead of addition.

If <weekday> is 0, it means the date to start or end daylight saving is at exactly
the given date. In that case, the value must not be negative. If <weekday>
is not zero, then the daylight saving starts or ends on or after
the given date if <day> is positive, or on or before the given date if <day> is
negative. If <day> is -1, it means the <weekday> on or before the end-of-the-month
(in other words the last occurrence of <weekday> in that month).

Optional values inside [ ] are assumed to be 0 if they are not specified.
Midnight means 0:0:0 of the given date.

Example 1:
Starts at midnight on 1st Sunday of April; ends at midnight on the last Sunday
of October; add 1 hour (USA, N. America). Below are all equivalent rules:

start=4/1/7/0:0:0;end=10/31/7/0:0:0;save=1
start=4/1/7;end=10/-1/7;save=1
start=4/1/7/0;end=10/-1/7/0;save=1

Example 2:
Starts at midnight on last Sunday of April; ends at midnight on the last Sunday
of September; add 1 hour (Egypt):

start=4/-1/7;end=9/-1/7;save=1 (Egypt)

Example 3:
Starts at midnight on first Sunday of October; ends at midnight on the 3rd
Sunday of March; add 1 hour (New Zealand):

start=10/1/7;3/22/7;save=1 (New Zealand)