Updating List in lis

Hello.

I appreciate if you could help me. I have a data list in Firebase, and this list has 4 fields: brigadista type doc ref (user), horaconfirmado type datetime, horallegado type datetime, and nombre type string.

I'm displaying this list in a ListView and I want to update the datetime fields for each one, but I can't find a way to do it; it only creates a new field

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