How to insert an accumulative attribute in dynamic text element based on Date field (

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I've got a line feature class that contains Date field. I've made a layout view in order to display time animation of this feature class. I've managed to enable the time option in the layer and to create a Data Frame Time text in correspondence to the elapsed time.

I'm looking to enrich the layout by creating a dynamic text element of the feature class' accumulated 'Shape_Length' field, according to the elapsed date\time - time elapsing >accumulated 'Shape_Length' gets bigger.

I've tried several ways to do it, but didn't succeed so far: 1. I've tried inspecting the Data Frame Time element Text syntax --- --- but couldn't figure how to change it to show the 'Shape_Length' field.
2. I've try an alternative approach: to create a date based graph. I've followed this link, and search quite along time in the Advanced Properties of the graph how to make it a time enabled and also how to make it accumulative. Didn't work as well.

I think the answer would be in connection to the LayerTime function.



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