[ https://issues.jboss.org/browse/DROOLS-2777?page=com.atlassian.jira.plugi... ] Guilherme Carreiro closed DROOLS-2777. -------------------------------------- Resolution: Done Dates are persisted with UTC timezone in Workbench. For example, the "DateTable.gdst" provided by the sample kjar has the "2018-04-30 21:00:00.0 UTC" value, see: <value> <valueDate>2018-04-30 21:00:00.0 UTC</valueDate> <valueString></valueString> <dataType>DATE</dataType> <isOtherwise>false</isOtherwise> </value> Since the server was in the "Europe/Vilnius" timezone, the inputted value was converted from "2018-05-01 00:00:00.0 EEST" to "2018-04-30 21:00:00.0 UTC" when this GDT was persisted (as you can see in the snippet above). When the user changes the timezone to "Europe/Prague" and opens the GDT Editor, the value is converted from "2018-04-30 21:00:00.0 UTC" (from the "DateTable.gdst" file) to "2018-04-30 23:00:00.0 CEST". Notice that no date was changed, the Workbench just considers the current machine timezone for presentation purpose. We recommend the use of the drools.dateformat parameter as something like -Ddrools.dateformat="dd-MM-yyyy z" (including the timezone), to avoid any misinterpretation during the presentation of these values. -- This message was sent by Atlassian JIRA (v7.5.0#75005)