How can i set an external datetime variable to the current time?

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 Thee was an old topic from 2006 with this question, but it wasn't resolved.

 Is this even possible?  I have an external datetime that I want to be a user input as a string in the TIME_DATE|TIME_SECONDS (or TIME_MINUTES) format, but I want it to be preset to the current time so the user doesn't have to keep adjusting more than necessary.

 Thank you.

 
Actually it can be done but you have to convert from a to b to c. Something like that. Basically, it is nuisance.
 
Could anyone help with it?  Or could you point me in the right direction?   I couldn't figure it out reading the documentation.   Thanks =)
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