Convert Timestamp to Milliseconds since Epoch in Python

Code description

This code snippets provides different approaches to convert a Python timestamp object to an integer that denotes the total milliseconds since Epoch (midnight 1st Jan 1970 UTC, UNIX time).

Output:

    1661169251815.902
    1661133251815.902

*Your result can be different depends on the time when you run the code. The result is the same no matter if we use utcnow() or now() as they both represent the same time.

However, if your input timestamp format is string, you need to be careful about time zone information when converting them to timestamp, i.e. specify the right time zone accordingly. 

Code snippet

    import datetime
    
    now = datetime.datetime.utcnow()
    now_local = datetime.datetime.now()
    
    epoch = datetime.datetime.utcfromtimestamp(0)
    
    milliseconds = (now - epoch).total_seconds() * 1000.0
    print(milliseconds)
    
    # For python version >=3.3
    milliseconds = now.timestamp()*1000.0
    print(milliseconds)