Can t compare naive and aware datetime now challenge datetime end

Question

I am trying to compare the current date and time with dates and times specified in models using comparison operators   if challenge datetime start  lt   datetime now    lt   challenge datetime end    The script errors out with    TypeError  can t compare offset-naive and offset-aware datetimes   The models look like this   class Fundraising Challenge models Model       name   models CharField max length 100      datetime start   models DateTimeField       datetime end   models DateTimeField     I also have django using locale date and times   What I haven t been able to find is the format django uses for DateTimeField     Is it naive or aware   And how do I get datetime now   to recognize locale datetime

User · Answer

So the way I would solve this problem is to make sure the two datetimes are in the right timezone.

I can see that you are using datetime.now() which will return the systems current time, with no tzinfo set.

tzinfo is the information attached to a datetime to let it know what timezone it is in. If you are using naive datetime you need to be consistent through out your system. I would highly recommend only using datetime.utcnow()

seeing as somewhere your are creating datetime that have tzinfo associated with them, what you need to do is make sure those are localized (has tzinfo associated) to the correct timezone.

Take a look at Delorean, it makes dealing with this sort of thing much easier.

User · Answer

You are trying to set the timezone for date time which already has a timezone  Use replace and astimezone functions  local tz   pytz timezone  Asia Kolkata    current time   datetime now   replace tzinfo pytz utc  astimezone local tz

User · Answer

Just  dt   datetimeObject strftime format    format   your datetime format ex    Y  d  m  dt   datetime datetime strptime dt format   So do this  start time   challenge datetime start strftime   Y  d  m  H  M  S   start time   datetime datetime strptime start time   Y  d  m  H  M  S    end time   challenge datetime end strftime   Y  d  m  H  M  S   end time   datetime datetime strptime end time   Y  d  m  H  M  S    and then use start time and end time

User · Answer

Disable time zone  Use challenge datetime start replace tzinfo None     You can also use replace tzinfo None  for other datetime   if challenge datetime start replace tzinfo None   lt   datetime now   replace tzinfo None   lt   challenge datetime end replace tzinfo None

User · Answer

datetime datetime now is not timezone aware   Django comes with a helper for this  which requires pytz  from django utils import timezone now   timezone now     You should be able to compare now to challenge datetime start

User · Answer

One line of code solution  if timezone aware var  lt   datetime datetime now timezone aware var tzinfo       pass  some code   Explained version    Timezone info of your timezone aware variable timezone   your timezone aware variable tzinfo    Current datetime for the timezone of your variable now in timezone   datetime datetime now timezone     Now you can do a fair comparison  both datetime variables have the same time zone if your timezone aware variable  lt   now in timezone      pass  some code   Summary  You must add the timezone info to your now   datetime  However  you must add the same timezone of the reference variable  that is why I first read the tzinfo attribute

User · Answer

By default  the datetime object is naive in Python  so you need to make both of them either naive or aware datetime objects  This can be done using   import datetime import pytz  utc pytz UTC  challenge datetime start   utc localize challenge datetime start   challenge datetime end   utc localize challenge datetime end     now both the datetime objects are aware  and you can compare them   Note  This would raise a ValueError if tzinfo is already set  If you are not sure about that  just use  start time   challenge datetime start replace tzinfo utc  end time   challenge datetime end replace tzinfo utc    BTW  you could format a UNIX timestamp in datetime datetime object with timezone info as following  d   datetime datetime utcfromtimestamp int unix timestamp   d with tz   datetime datetime      year d year      month d month      day d day      hour d hour      minute d minute      second d second      tzinfo pytz UTC

User · Answer

It is working form me  Here I am geeting the table created datetime and adding 10  minutes on the datetime  later depending on the current time  Expiry Operations are done   from datetime import datetime  time  timedelta import pytz   Added 10 minutes on database datetime  table datetime    2019-06-13 07 49 02 832969   example     Added 10 minutes on database datetime   table datetime    2019-06-13 07 49 02 832969   example   table expire datetime   table datetime   timedelta minutes 10      Current datetime current datetime   datetime now       replace the timezone in both time expired on   table expire datetime replace tzinfo utc  checked on   current datetime replace tzinfo utc    if expired on  lt  checked on      print  Time Crossed  else      print  Time not crossed      It worked for me

[python] Can't compare naive and aware datetime.now() <= challenge.datetime_end

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