'Unable to sort datetime using variable computed from datetime string

I am trying to sort a table by datetime in descending order. I currently am trying to use a variable to be the field to be used in sorting.

Example data:

header A datetime
First 01 Jan 2021
Second 17 Aug 2021

I created a variable, as seen below,to try to sort the records. intiail value expression

properties

After creating the Long variable from the DATEVALUE expression, after converting to string, it shows null when I load it into preview. Also, it does not sort properly after using it as a sort field.

Some help is much appreciated.



Solution 1:[1]

The dataset included the epoch of the date. I used that to sort.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 diggledoot