Zope+FB+mx - DateTime errrrrrrrror....

Chris Irish chris.irish at libertydistribution.com
Thu Aug 19 20:32:41 CEST 2004


fowlertrainer at anonym.hu wrote:

> Hi !
>
> I think that I have been found a bug in mx.DateTime...
> So:
> I use FireBird, and in this RDBMS the datetime fields are "doubles".
> So if I set them to 0, the values the fields are '1899-12-30 01:00:00'.
>
> When I try to see this datetime as European format (YYYY.MM.DD HH:MM:SS)
> I get error.
>
> Example1:
> s='1899-12-30 01:00:00'
> nv=str(s)
> nv=DateTime(s)
> s=nv.strftime('%Y.%m.%d. %H:%M:%S')
> # it is makes error
>
Well I'm no expert on the mx.Datetime module, but lets so if I can 
help.  In your example #1 I tried doing it in the interpretor exactly as 
you did and ran into some problems.  First, you set 's' equal to a 
string of the date your wanting I presume.  Then your calling the 
builtin str method on it.  Why when it's already a string?  Then your 
calling the DateTime method however it needs to be qualified through the 
mx.DateTime module
i.e.
import mx.DateTime
mx.DateTime.DateTime(s)

However your passing in s to this method as a string.  In the 
mx.DateTime docs it says and I quote, 
"|DateTime(year,month=1,day=1,hour=0,minute=0,second=0.0)|
Constructs a DateTime instance from the given values.

So you need to be passing in integer values except for the seconds 
argument which can be a float.  If you call the method in the correct 
way it will return a datetime object of the date you want then you can 
use strftime to format it in the european fasion yu desire.  One final 
note all datetime objects are created with a 24 hour time, not 12.  So 
5pm will be 17:00 after you string format the object, if my memory is 
correct.  Just remember that for if/when you take those times back out 
of the database to display to a user you'll need to change them to a 12 
hour time, unless they don't mind reading it like that.  We use 
PostgreSQL for our databases and whenever a time object is put into the 
database it is automatically converted to ticks.  I'm not sure if it's 
the same way with yours or not.  So when pulling a time back out it 
would be converted like:

time = mx.DateTime.localtime(item_object_fromDB).strftime("%m/%d/%Y 
etc....")

There is also another method called strptime which parses a time string 
according to a particular format but I haven't used it enough to 
instruct you on it's us, but it could be helpful.

Hopefully something I said will help, be sure to look at the docs @:

http://www.egenix.com/files/python/mxDateTime.html#DateTime
and
http://docs.python.org/lib/module-time.html

Good Luck,  Chris


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