how to standardise backups of chats from different apps?

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I'm trying to standardise files: text, pdf, CVS with chat history to one clean file which I can use to analyze data.
The documents coming from messages, WhatsApp and email, all of them have a different setup, different styles (a simple example is a date: in one 01-oct-2021, in second 01/10/2021 and more and more)

I'm asking because to make it or fix it one by one is impossible, just emails I have around 4000.

I need to use this data to create a timeline.


I hope this makes a sense what I'm describing

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