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)

The way you do it is the correct way, because js includes milliseconds in the date/time. Python (and PHP) as far as I know, don't. For more precision you could use /1000.0.

For others still getting an error: I had a similar issue but the unix timestamp was in microseconds, i.e. I had to divide the timestamp by 1000000 to get the correct result.

dt = datetime.datetime.fromtimestamp(1502360499615921)