Time Zones

To set the time zone on an historical data source

The time shown for a selected historical data item is based on the selected time zone. By default, this zone is set to the time zone of your display (as it is set on the Current Display Settings dialog box). However, you can configure the time zone by selecting a different zone from the Time Zone field, such as the time zone of the server.     

By configuring the time zone, it becomes easier to collaborate with others around the world. For example, if you work in Seattle (Pacific time zone) and your colleagues work in Atlanta (Eastern time zone), you can adjust the time zone of your chart to match theirs.

In addition to these standard time zones, Proficy Portal allows you to select the following time zones:

Time Zones Properties 



Client Time Zone

The time zone of the local client computer (not the server machine).

Display Time Criteria Time Zone

Uses the time zone specified in the display (set on the Current Display Settings dialog box).

Data Server Time Zone

For Historian, this is the server's time zone. For CIMPLICITY Logger, this is the Proficy Portal server's time zone.

Tag Time Zone

defines the time zone of a data source item. This time zone includes a Greenwich Mean Time (GMT) offset (called a Time Zone Bias in Historian) if one is configured for the data source item. By default, the GMT offset in Historian is 0.

When a Historian time zone bias does not correspond to the offset of a known time zone, Proficy Portal uses a time zone/offset of GMT+00:00. For example, if the time zone bias for a tag in Historian is set to 450 minutes, when the tag is plotted in a Time chart, and the iHistorian data source is configured to use the tag time zone, the chart will use an offset of GMT+00:00. Short/Long Time Zone legend items (if they are set to display on the chart) are displayed as `GMT+00:00'.

NOTE: You can also configure time zones when you create a datalink. Using the Tag time zone with a datalink requires you to set the Time Zone Bias in Historian; otherwise, the datalink displays the Greenwich Mean Time offset as 0.

In time and event charts, each pen has its own time zone. In an XY chart, only the X axis pen has a time zone; Y axis pens use the time span and time zone of the X axis pen. Consequently, you can configure only one time zone for the XY chart.

When two or more historical sources are used in expressions, and the time zone of one or more sources is changed, the time zone will automatically be changed to the default time zone.

See Also

Time Criteria

To set the time zone on an historical data source

Setting preferences for the current display