Converting ISO 8601 date time to seconds in Python

If you want to get the seconds since epoch, you can use python-dateutil to convert it to a datetime object and then convert it so seconds using the strftime method. Like so:

>>> import dateutil.parser as dp>>> t = '1984-06-02T19:05:00.000Z'>>> parsed_t = dp.parse(t)>>> t_in_seconds = parsed_t.timestamp()>>> t_in_seconds'455051100'

So you were halfway there :)

Your date is UTC time in RFC 3339 format, you could parse it using only stdlib:

from datetime import datetimeutc_dt = datetime.strptime('1984-06-02T19:05:00.000Z', '%Y-%m-%dT%H:%M:%S.%fZ')# Convert UTC datetime to seconds since the Epochtimestamp = (utc_dt - datetime(1970, 1, 1)).total_seconds()# -> 455051100.0

See also Converting datetime.date to UTC timestamp in Python

How do I convert it back to ISO 8601 format?

To convert POSIX timestamp back, create a UTC datetime object from it, and format it using .strftime() method:

from datetime import datetime, timedeltautc_dt = datetime(1970, 1, 1) + timedelta(seconds=timestamp)print(utc_dt.strftime('%Y-%m-%dT%H:%M:%S.%fZ'))# -> 1984-06-02T19:05:00.000000Z

Note: It prints six digits after the decimal point (microseconds). To get three digits, see Formatting microseconds to 2 decimal places (in fact converting microseconds into tens of microseconds).

Here is a solution in Python 3:

$ date +%s1428030452$ TZ=US/Pacific date -d @1428030452 '+%Y%m%d %H:%M:%S %z'20150402 20:07:32 -0700$ TZ=US/Eastern date -d @1428030452 '+%Y%m%d %H:%M:%S %z'20150402 23:07:32 -0400$ python3>>> from datetime import datetime,timezone>>> def iso2epoch(ts):...     return int(datetime.strptime(ts[:-6],"%Y%m%d %H:%M:%S").replace(tzinfo=timezone.utc).timestamp()) - (int(ts[-2:])*60 + 60 * 60 * int(ts[-4:-2]) * int(ts[-5:-4]+'1'))...>>> iso2epoch("20150402 20:07:32 -0700")1428030452>>> iso2epoch("20150402 23:07:32 -0400")1428030452>>>