class Test(Model):
time = DateTimeField()
# ...
row = Test.select()[0]
test.time
This returns a string that looks like this: 2017-01-23 01:01:39+01:00. How can I get it as a datetime object instead? Do I have to parse it manually?
Also I would be interested if there is any documentation on how to use the DateTimeField. The official documentation doesn't have anything on it.
Are you using SQLite? If so, SQLite doesn't have a dedicated datetime type, so datetimes are stored as strings in the DB. What peewee will do is recognize certain datetime formats coming out of the DB and convert them to datetime objects. What you need to do is ensure that either:
When you create/save your object, that you assign a datetime object to the field.
When reading back pre-existing data, that the data is in a recognized format.
The formats peewee supports out-of-the-box for datetime field are:
YYYY-mm-dd HH:MM:SS.ffffff
YYYY-mm-dd HH:MM:SS
YYYY-mm-dd
It looks like your has zone info. I'd suggest converting to UTC and dropping the zone info. That should fix it.
Have you tried adding a default like this?
time = DateTimeField(default=datetime.datetime.now())
Or when adding an entry add it as a datetime.datetime object directly:
test = Test(....., time=datetime.datetime.strptime("2018-3-15", '%Y-%m-%d'))
In the second case you don't need to specify anything in the class definition...
Related
I have a Django project, and I want to save created_at datetime in the database. I generate datetime.now with jdatetime (or Khayyam) python package and try to save this in DateTimeField. But sometimes it raises error because the Gregorian(miladi) date of the entry does not exist. what can I do about this?
In my idea, you can save two model fields.
One is DateTimeField contains gregorian datetime, and
another one, CharField contains converted Jalali to a String value and save it.
The DateTimeField for functionality, e.g., filter between to datetime.
The StringField for representing in response(without overload).
I have noticed that when I return records from my SQL database using the following: the_records = records.objects.filter(datetime__contains="2015-01-15"), I get back the wrong records because the timezone is affecting the function call somehow - I know this because if I temporarily disable the timezone, the right records are returned. Can anyone offer assistance on what I should do to fix this problem (I still need to use the timezone).
Regards, Mark
I'm assuming that datetime is a Django DateTime field, and you're trying to get the results that have a value that matches the date '2015-01-15', ignoring the actual time.
In that case, you probably want to do a date query, like: Records.objects.filter(datetime__date=datetime.date(2015, 1, 15))
If you need to query your db with a timezone specific date, you can just create a datetime object that is aware of it's timezone.
Example:
# Get your timezone
from django.utils import timezone
my_timezone = timezone.get_current_timezone()
# Get create your timezone aware datetime object
from datetime import datetime
query_date = datetime(2015,01,15).replace(tzinfo=my_timezone)
# now you can run your query with a timezone specific datetime object
the_records = records.objects.filter(datetime=query_date)
This should solve your issue and get you the accurate results you need.
Please let me know if you still have any questions.
This link has more info related to django timezones if you are interested in learning more.
I'm looking for a way to store a timezone-aware datetime object in mongoDB.
I read here: Create an ISODate with pyMongo that storing a datetime object in MongoDB with pymongo will result in a ISODate object being stored (or an object that looks like this when querying from the shell)
Using the datetime.replace(tzinfo=[...]) method, there is a way to make the datetime object aware of its timezone. Unfortunately, when storing such object in mongoDB, the timezone information seems to be lost.
My question is: is there a way to store the timezone in the ISODate object itself, so that it looks like something like this: ISODate("2012-07-14T01:00:00+01:00") when querying the shell and so that the datetime object is still timezone aware when reloaded with pymongo later on?
Thanks a lot for your help!
No, there's not a way to do that. MongoDB's ISODate is just a wrapper around a Date object, which is just a moment in time represented by an integer corresponding to the number of milliseconds elapsed since Jan 1, 1970 UTC. There is no way for it to retain an offset.
You might consider storing it just as a string, perhaps in a secondary field so you can still query for that moment in time while still knowing the local time and offset.
Also, assuming you're using tzdb time zones from either pytz or dateutil, such as "Europe/London", you should recognize that there's no way to determine a time zone from just an offset. So if you really need to reconstruct a full tz aware datetime, then you'll also have to store the time zone identifier in a separate field.
from datetime import datetime
from dateutil.tz import *
def to_utc(date_time):
return date_time.replace(tzinfo=tzlocal()).astimezone(tzoffset(None, 0))
I have a CharField in my model as well as my database. I want to convert this CharField column to real datetime Django format. I have this insert query like
test.objects.create(voice=m.voice, size=m.size, start_time=get_time.get('min_time'),)
I would like to create a function to solve it, but not sure how to do it. Please help.
I think directly change the character field into datetime field is hard. Your need to do it one by one.
Create a new datetime column e.g. start_datetime
Create a script to convert the start_time from string into datetime object.
Edit all code that depend on start_time
Delete the start_time column
This is the example conversion from string to datetime code.
import time
for obj in Test.objects.all():
obj.start_datetime = time.strptime(obj.start_time, "%d %b %y")
obj.save()
You might want to read this python time library.
I am making a blog and store the publishing date of a blog post in the datastore. It looks like this:
post.date = datetime.datetime.now()
It now displays like: 2010-10-04 07:30:15.204352 But I want the datetime to be displayed differently. How (and where) can I set that how the date is displayed? I'd like to set the date format like in UNIX date function (like %Y/%m etc). I tried to add some parameters in my templates but that returned errors.
Thanks in advance!
-skazhy
I think strftime is the method you're looking for.
From the link:
>>> d.strftime("%d/%m/%y")
'11/03/02'
If you pass in the result of the strftime in your 'template_values' or similar (the dictionary you use to pass parameters to the template) instead of the actual date it will be displayed instead.
You can use .strftime() on a datetime object to do the formatting. See the relevant python documentation for details.