JavaScript timestamp to Python datetime conversion

Your current method is correct, dividing by 1000 is necessary because your JavaScript returns the timestamp in milliseconds, and datetime.datetime.fromtimestamp() expects a timestamp in seconds.

To preserve the millisecond accuracy you can divide by 1000.0, so you are using float division instead of integer division:

>>> dt = datetime.datetime.fromtimestamp(jsts/1000.0)
>>> dt
datetime.datetime(2012, 4, 23, 11, 30, 4, 950000)

I've had the same issue, thanks to @andrew-clark for the answer, i've build a small example to handle both cases:

     try:
        # when timestamp is in seconds
        date = datetime.fromtimestamp(timestamp)
    except (ValueError):
        # when timestamp is in miliseconds
        date = datetime.fromtimestamp(timestamp / 1000)