Change to daylight saving time

Use this function to define Daylight Saving Time (DST) transition rules for world time zones.

World time zones are used to convert dates and times sent to Production Scheduler to the primary time standard "UTC" (Coordinated Universal Time).

Note:

UTC (Coordinated Universal Time) is the equivalent of GMT/GT (Greenwich Mean Time/Greenwich Time).

The rules that determine when Daylight Saving Time (DST) starts or ends can change, and for some time zones changes every year. For Production Scheduler to correctly convert between a time zone and UTC you enter and update time zone information using a set procedure, as follows - you must be careful to make changes in the order below:

Define world time zones in the Time zones function (TIMEZONEINFO).
Once defined, you must set the PSTIMEZONE - Server time zone parameter (EXAPP chapter, MIS group) to the time zone in which your server is located.
Define Daylight Saving Time (DST) transition rules in this function (TIMETRANS).
Define transition rules to Daylight Saving Time (DST) across world time zones in the Adjustment rules of daylight saving time function (TIMEADJUST).

Warning

Prerequisites

See also Refer to documentation Implementation

Screen management

The Change to daylight saving time function displays existing transition rule codes in a grid, or table.

Presentation

Each line of the table represents a regular or fixed generic Daylight Saving Time (DST) transition rule. The transition day, month and time values are included.

Whilst these rules are generic and do not apply at this stage to a specific world time zone, you can define rules that recognize a fixed date on which DST in a world time zone changes, or the common date on which DST changes for a world time zone.

Fields presentation

Code (field COD)

Use this field to identify a transition rule code. The format of your transition rule code must include specific transition data which you define using one of the following formats:

AAA_BBB_X_YY
AAA_FXD_X_YY

Where:

AAA = the month of the transition (APR, MAY, JUN).

BBB = the day of the transition (SUN, MON, TUE).

FXD = preset characters to use when Daylight Saving Time (DST) transition occurs on a fixed date.

X = the week of the month (1 - 5).

YY = the hour when the transition occurs (2 = 02:00am, 23 = 23:00pm).

For example, a DST transition on the 4th Monday of November at 03:00am, would have the code NOV_MON_4_3, whereas a change to DST that occurs on the 4th of March at 02:00am indefinitely would have the code MAR_FXD_4_2.

Warning

Description (field DES)

Use this field to describe this transition rule code. For example, "DST - Fall".

Fixed date (field FXDFLG)

Select this check box if Daylight Saving Time (DST) transitions on a fixed date, otherwise leave clear.

Day (field DDAY)

Type in a number from 1 to 31 to represent the day of the month when the Daylight Saving Time (DST) transition occurs.

Leave as 0 if the Fixed date check box (FXDFLG) is clear.

Month (field MON)

Type in, or select the month of the year when the Daylight Saving Time (DST) transition occurs.

Week (field WEE)

Type in, or select the week of the month (1 - 5) when the Daylight Saving Time (DST) transition occurs.

Leave as 0 if the Fixed date check box (FXDFLG) is selected.

Day of the week (field DAYWEE)

Type in, or select the day of the week when the Daylight Saving Time (DST) transition occurs.

Leave blank if the Fixed date check box (FXDFLG) is selected.

Time (field TIMDAY)

Type in the time, in hours, when the Daylight Saving Time (DST) transition occurs. For example, 2 = 02:00am, 23 = 23:00pm.

Action panel

Save

Click the Save action to create or add a new time zone and UTC offset.

Note:

Click the quick Edit

Examples

By its own definition, a time zone standard time or Daylight Saving Time (DST) will change.

The following scenarios demonstrate when DST changes are required and which functions to use.

The daylight-saving time transition day changes:

Use the Change to daylight saving time function (TIMETRANS) to add a new transition rule, if required.
Use the Adjustment rules of daylight saving time function (TIMEADJUST) to add a new adjustment rule.

A new time zone is created for your location:

Use the Change to daylight saving time function (TIMETRANS) to add a new transition rule, if required.
Use the Adjustment rules of daylight saving time function (TIMEADJUST) to add a new adjustment rule.
Use the Time zones function (TIMEZONEINFO) to add the new time zone.

Your time zone stops using DST:

Use the Adjustment rules of daylight saving time function (TIMEADJUST) to add a new adjustment rule.

Your time zone starts using DST:

Use the Change to daylight saving time function (TIMETRANS) to add a new transition rule, if required.
Use the Adjustment rules of daylight saving time function (TIMEADJUST) to add a new adjustment rule.
Use the Time zones function (TIMEZONEINFO) to reference the new adjustment rule (in the Daylight saving time field (TADCOD)).

Error messages

Generic messages

In addition to the generic error messages, the following messages can appear during the entry :

The only error messages are the generic ones.

Tables used