https://community.esri.com/t5/arcgis-pro-questions/use-of-starttime-in-expression/m-p/1353950#M75602 <P>Hi all, I am working to create an animation using temporal GPS data. The data ranges over 8 months and I show a span of 7 days with a step interval of 2 days. I would like to make the older points become partially transparent over time as the animation progresses, but am struggling to find the right expression. I am using the expression builder under Vary symbology by attribute, Transparency.&nbsp;I believe it should read as:&nbsp;</P><P>DateDiff($feature.point_datetime,<FONT color="#FF0000">XX</FONT>)</P><P>The first feature is the datetime of the point and the XX should use the startTime or Map Time but I am unsure how to use this as a variable in the expression and my many searches have not found the answer.</P><P>Any suggestions would be greatly appreciated.</P> Tue, 28 Nov 2023 07:06:44 GMT KelseyGreen 2023-11-28T07:06:44Z https://community.esri.com/t5/arcgis-pro-questions/use-of-starttime-in-expression/m-p/1353950#M75602 <P>Hi all, I am working to create an animation using temporal GPS data. The data ranges over 8 months and I show a span of 7 days with a step interval of 2 days. I would like to make the older points become partially transparent over time as the animation progresses, but am struggling to find the right expression. I am using the expression builder under Vary symbology by attribute, Transparency.&nbsp;I believe it should read as:&nbsp;</P><P>DateDiff($feature.point_datetime,<FONT color="#FF0000">XX</FONT>)</P><P>The first feature is the datetime of the point and the XX should use the startTime or Map Time but I am unsure how to use this as a variable in the expression and my many searches have not found the answer.</P><P>Any suggestions would be greatly appreciated.</P> Tue, 28 Nov 2023 07:06:44 GMT https://community.esri.com/t5/arcgis-pro-questions/use-of-starttime-in-expression/m-p/1353950#M75602 KelseyGreen 2023-11-28T07:06:44Z