How can I convert a datetime object to milliseconds since epoch (unix time) in Python?

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How can I convert a datetime object to milliseconds since epoch (unix time) in Python?

I have a Python datetime object that I want to convert to unix time, or seconds/milliseconds since the 1970 epoch.

How do I do this?

Answer #1:

It appears to me that the simplest way to do this is

import datetime
epoch = datetime.datetime.utcfromtimestamp(0)
def unix_time_millis(dt):
    return (dt - epoch).total_seconds() * 1000.0
Answered By: Sophie Alpert

Answer #2:

In Python 3.3, added new method timestamp:

import datetime
seconds_since_epoch = datetime.datetime.now().timestamp()

Your question stated that you needed milliseconds, which you can get like this:

milliseconds_since_epoch = datetime.datetime.now().timestamp() * 1000

If you use timestamp on a naive datetime object, then it assumed that it is in the local timezone. Use timezone-aware datetime objects if this is not what you intend to happen.

Answered By: eshizhan

Answer #3:

>>> import datetime
>>> # replace datetime.datetime.now() with your datetime object
>>> int(datetime.datetime.now().strftime("%s")) * 1000
1312908481000

Or the help of the time module (and without date formatting):

>>> import datetime, time
>>> # replace datetime.datetime.now() with your datetime object
>>> time.mktime(datetime.datetime.now().timetuple()) * 1000
1312908681000.0

Answered with help from: http://pleac.sourceforge.net/pleac_python/datesandtimes.html

Documentation:

Answered By: miku

Answer #4:

You can use Delorean to travel in space and time!

import datetime
import delorean
dt = datetime.datetime.utcnow()
delorean.Delorean(dt, timezone="UTC").epoch

http://delorean.readthedocs.org/en/latest/quickstart.html
 

Answered By: working4coins

Answer #5:

This is how I do it:

from datetime import datetime
from time import mktime
dt = datetime.now()
sec_since_epoch = mktime(dt.timetuple()) + dt.microsecond/1000000.0
millis_since_epoch = sec_since_epoch * 1000
Answered By: estani

Answer #6:

Recommendedations from the Python 2.7 docs for the time module

Converting between time representations

Answered By: Ankur Agarwal

Answer #7:

from datetime import datetime
from calendar import timegm
# Note: if you pass in a naive dttm object it's assumed to already be in UTC
def unix_time(dttm=None):
    if dttm is None:
       dttm = datetime.utcnow()
    return timegm(dttm.utctimetuple())
print "Unix time now: %d" % unix_time()
print "Unix timestamp from an existing dttm: %d" % unix_time(datetime(2014, 12, 30, 12, 0))
Answered By: corford

Answer #8:

>>> import datetime
>>> import time
>>> import calendar
>>> #your datetime object
>>> now = datetime.datetime.now()
>>> now
datetime.datetime(2013, 3, 19, 13, 0, 9, 351812)
>>> #use datetime module's timetuple method to get a `time.struct_time` object.[1]
>>> tt = datetime.datetime.timetuple(now)
>>> tt
time.struct_time(tm_year=2013, tm_mon=3, tm_mday=19, tm_hour=13, tm_min=0, tm_sec=9,     tm_wday=1, tm_yday=78, tm_isdst=-1)
>>> #If your datetime object is in utc you do this way. [2](see the first table on docs)
>>> sec_epoch_utc = calendar.timegm(tt) * 1000
>>> sec_epoch_utc
1363698009
>>> #If your datetime object is in local timeformat you do this way
>>> sec_epoch_loc = time.mktime(tt) * 1000
>>> sec_epoch_loc
1363678209.0

[1] http://docs.python.org/2/library/datetime.html#datetime.date.timetuple

[2] http://docs.python.org/2/library/time.html

Answered By: Jinesh

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