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lastconnection = datetime.strptime("21/12/2008", "%d/%m/%Y").strftime('%Y-%m-%d')
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import datetime as dt
dt.datetime.utcfromtimestamp(seconds_since_epoch).strftime("%Y/%m/%d %H:%M")
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lastconnection = datetime.datetime.strptime("21/12/2008", "%d/%m/%Y").strftime('%Y-%m-%d')
#corrected version