How to add delta to python datetime.time?
Solution 1
datetime.time
objects do not support addition with datetime.timedelta
s.
There is one natural definition though, clock arithmetic. You could compute it like this:
import datetime as dt
now = dt.datetime.now()
delta = dt.timedelta(hours = 12)
t = now.time()
print(t)
# 12:39:11.039864
print((dt.datetime.combine(dt.date(1,1,1),t) + delta).time())
# 00:39:11.039864
dt.datetime.combine(...)
lifts the datetime.time t
to a datetime.datetime
object, the delta is then added, and the result is dropped back down to a datetime.time
object.
Solution 2
All the solutions above are too complicated, OP had already shown that we can do calculation between datetime.datetime
and datetime.timedelta
, so why not just do:
(datetime.now() + timedelta(hours=12)).time()
Solution 3
How would this work? datetime.datetime.now().time()
returns only hours, minutes, seconds and so on, there is no date information what .time()
returns, only time.
Then, what should 18:00:00 + 8 hours
return?
There's not answer to that question, and that's why you can't add a time and a timedelta.
In other words:
18:28:44, Sep. 16, 2012 + 8 hours #makes sense: it's 2:28:44, Sep. 17, 2012
18:28:44 + 8 hours # Doesn't make sense.
xliiv
Updated on July 14, 2021Comments
-
xliiv almost 3 years
From:
http://docs.python.org/py3k/library/datetime.html#timedelta-objects
A timedelta object represents a duration, the difference between two dates or times.
So why i get error with this:
>>> from datetime import datetime, timedelta, time >>> datetime.now() + timedelta(hours=12) datetime.datetime(2012, 9, 17, 6, 24, 9, 635862) >>> datetime.now().date() + timedelta(hours=12) datetime.date(2012, 9, 16) >>> datetime.now().time() + timedelta(hours=12) Traceback (most recent call last): File "<stdin>", line 1, in <module> TypeError: unsupported operand type(s) for +: 'datetime.time' and 'datetime.timedelta'