Convert date to datetime in Python
PythonDatetimeDatePython Problem Overview
Is there a built-in method for converting a date
to a datetime
in Python, for example getting the datetime
for the midnight of the given date? The opposite conversion is easy: datetime
has a .date()
method.
Do I really have to manually call datetime(d.year, d.month, d.day)
?
Python Solutions
Solution 1 - Python
You can use datetime.combine(date, time)
; for the time, you create a datetime.time
object initialized to midnight.
from datetime import date
from datetime import datetime
dt = datetime.combine(date.today(), datetime.min.time())
Solution 2 - Python
There are several ways, although I do believe the one you mention (and dislike) is the most readable one.
>>> t=datetime.date.today()
>>> datetime.datetime.fromordinal(t.toordinal())
datetime.datetime(2009, 12, 20, 0, 0)
>>> datetime.datetime(t.year, t.month, t.day)
datetime.datetime(2009, 12, 20, 0, 0)
>>> datetime.datetime(*t.timetuple()[:-4])
datetime.datetime(2009, 12, 20, 0, 0)
and so forth -- but basically they all hinge on appropriately extracting info from the date
object and ploughing it back into the suitable ctor or classfunction for datetime
.
Solution 3 - Python
The accepted answer is correct, but I would prefer to avoid using datetime.min.time()
because it's not obvious to me exactly what it does. If it's obvious to you, then more power to you. I also feel the same way about the timetuple
method and the reliance on the ordering.
In my opinion, the most readable, explicit way of doing this without relying on the reader to be very familiar with the datetime
module API is:
from datetime import date, datetime
today = date.today()
today_with_time = datetime(
year=today.year,
month=today.month,
day=today.day,
)
That's my take on "explicit is better than implicit."
Solution 4 - Python
You can use the date.timetuple()
method and unpack operator *
.
args = d.timetuple()[:6]
datetime.datetime(*args)
Solution 5 - Python
Today being 2016, I think the cleanest solution is provided by pandas Timestamp:
from datetime import date
import pandas as pd
d = date.today()
pd.Timestamp(d)
Timestamp is the pandas equivalent of datetime and is interchangable with it in most cases. Check:
from datetime import datetime
isinstance(pd.Timestamp(d), datetime)
But in case you really want a vanilla datetime, you can still do:
pd.Timestamp(d).to_datetime()
Timestamps are a lot more powerful than datetimes, amongst others when dealing with timezones. Actually, Timestamps are so powerful that it's a pity they are so poorly documented...
Solution 6 - Python
One way to convert from date to datetime that hasn't been mentioned yet:
from datetime import date, datetime
d = date.today()
datetime.strptime(d.strftime('%Y%m%d'), '%Y%m%d')
Solution 7 - Python
you can also use
date = datetime.utcnow().date()
dt = datetime.fromisoformat(date.isoformat())
print(dt)
> datetime.datetime(2021, 11, 15, 0, 0)
Solution 8 - Python
You can use easy_date to make it easy:
import date_converter
my_datetime = date_converter.date_to_datetime(my_date)
Solution 9 - Python
> Do I really have to manually call datetime(d.year, d.month, d.day)
No, you'd rather like to call
date_to_datetime(dt)
which you can implement once in some utils/time.py
in your project:
from typing import Optional
from datetime import date, datetime
def date_to_datetime(
dt: date,
hour: Optional[int] = 0,
minute: Optional[int] = 0,
second: Optional[int] = 0) -> datetime:
return datetime(dt.year, dt.month, dt.day, hour, minute, second)
Solution 10 - Python
You can use this class:
import time
import datetime
class TimingClass():
def __init__(self):
self.YEAR = datetime.date.today().year
self.MONTH = datetime.date.today().month
self.DATE = datetime.date.today().day
self.HOUR = datetime.datetime.now().hour
self.MINUTE = datetime.datetime.now().minute
self.SECONDS = datetime.datetime.now().second
self.TODAY = datetime.date.today()
self.YESTERDAY = datetime.datetime.strftime( (self.TODAY - datetime.timedelta(days = 1)) , '%Y-%m-%d')
self.TOMORROW = datetime.datetime.strftime( (self.TODAY + datetime.timedelta(days = 1)) , '%Y-%m-%d')
self.TODAY_datetime = datetime.datetime.combine(datetime.date.today(), datetime.datetime.min.time())
Solution 11 - Python
If you need something quick, datetime_object.date()
gives you a date of a datetime object.
Solution 12 - Python
I am a newbie to Python. But this code worked for me which converts the specified input I provide to datetime. Here's the code. Correct me if I'm wrong.
import sys
from datetime import datetime
from time import mktime, strptime
user_date = '02/15/1989'
if user_date is not None:
user_date = datetime.strptime(user_date,"%m/%d/%Y")
else:
user_date = datetime.now()
print user_date