The trick is to use the List Picker .Text to show the last added item, and use that when you just want the last.
https://groups.google.com/g/mitappinventortest/c/II_RlElGddU/m/J0q_E-2rAwAJ
The taglist call back (of all the dates and times) may not necessarily come back from firebase in a sorted alpha-numeric order, this would need to be sorted first (using list blocks) then you can select the last item in the list (use length of list to get the index), and then call back the data related to that date/time tag.
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