Write a simple Python Script

I am using "zbarcam" to scan QR Codes with a raspberry PI, the QR Code contains a timestamp and a "limitnumber". After scanning the QR Code with zbarcam the python script has to check if some conditions matches and log the events in to local files. 1. Script checks if timestamp-Format is correct 2. Script checks if the timestamp is younger then 4 days 3. Script checks if successfull attempts lower then limitnumber 4. If 2 - 3 true write informations to local file "[login to view URL]" and execute shell command 5. If 2 - 3 false write to "[login to view URL]" and execute shell command I need it ASAP!