How to decode js timestamp to python timestamp and vice versa?

Question

I am making a request to one of server and getting response like this:

result = {"object_type": "window_id", 
          "cctv_times" : ['1655375216687000', '1655375216717000', '1655375216717000', '1655375216775000']}

I am not able to understand the time format it is using and if I have to make a post request to that server with the current time, I am unable to convert the python timestamp into that format.

In python, if I convert the current time into a timestamp, it looks like this:

from datetime import datetime

time_now = datetime.now().strftime("%s%f")

This gives me results in something like:

1655375242179881

But in server response, there are already a few zeros at the end even though the time is live from there, what is the format and how to convert python time into that format?

1655375216 would be June 16 2022, which seems reasonable. The timestamp is simply in microseconds…? Simply divide by 1000000. — deceze
– deceze ♦, Commented Jun 16, 2022 at 10:36

Anentropic · Accepted Answer · 2022-06-16 10:36:17Z

1

We know that datetime.now().strftime("%s%f") is a timestamps measured in microseconds (since %s is seconds and %f is microseconds).

And 1655375216687000 and 1655375242179881 are the same length, which suggests your source data is also a timestamp measured in microseconds. (The fact that the last three digits are always 000 suggests that it was originally derived from a source with milliseconds precision, but the value is clearly microseconds).

We can use datetime.fromtimestamp: https://docs.python.org/3/library/datetime.html#datetime.datetime.fromtimestamp

However this expects a time in seconds, "as returned by time.time()"

So we can:

from datetime import datetime

datetime.fromtimestamp(int('1655375216687000') / 1e6)

Which returns datetime.datetime(2022, 6, 16, 11, 26, 56, 687000)

answered Jun 16, 2022 at 10:36

Anentropic

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1 Comment

Anentropic Over a year ago

I think you already found the way to get that: datetime.now().strftime("%s%f") gives a string value in the right format

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