GitHub user maxbobse added a comment to the discussion: Select transform 
returns NullPointerException when converting timestamp from String to Timestamp

I believe the main issue here is that depending on how you use the date format, 
it can cause problems:

You use the date format to convert an existing timestamp value to a string. 
Here you can basically do anything because there is no validation so 
'MM/dd/yyyy HH:mm:ss aa' is a valid format. Hop does not care if the outputted 
string is nonsense or not.

You use the date format to convert a string to a timestamp. Here the format has 
to be correct, otherwise you get an error as shown above.

Also when parsing a string to create a timestamp, the logic is different: 6 and 
06 are both accepted values for an hour if you use 'h'. 
If you export to a string, 'h' produces 6 while 'hh' produces 06.

Formatting can be so much fun ... :D

GitHub link: 
https://github.com/apache/hop/discussions/5948#discussioncomment-14880540

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