What is the Python equivalent of Javascript's `Date.prototype.toISOString`?

Question

In Javascript, Date.prototype.toISOString gives an ISO 8601 UTC datetime string:

new Date().toISOString()
// "2014-07-24T00:19:37.439Z"

Is there a Python function with behavior that matches Javascript's?

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Attempts:

Python's datetime.datetime.isoformat is similar, but not quite the same:

datetime.datetime.now().isoformat()
// '2014-07-24T00:19:37.439728'

Using pytz I can at least make UTC explicit:

pytz.utc.localize(datetime.now()).isoformat())
// '2014-07-24T00:19:37.439728+00:00'

Answer 1

You can use this code:

import datetime
now = datetime.datetime.now()
iso_time = now.strftime("%Y-%m-%dT%H:%M:%SZ") 

Answer 2

I attempted to format the string to exactly how it is in the javascript output.

from datetime import datetime

def iso_format(dt):
    try:
        utc = dt + dt.utcoffset()
    except TypeError as e:
        utc = dt
    isostring = datetime.strftime(utc, '%Y-%m-%dT%H:%M:%S.{0}Z')
    return isostring.format(int(round(utc.microsecond/1000.0)))

print iso_format(datetime.now())
#"2014-07-24T00:19:37.439Z"

Answer 3

Using f-strings in Python 3.6+

from datetime import datetime

f'{datetime.now():%Y-%m-%dT%H:%M:%SZ}'