Re: DST and datetime

2010-01-03 Thread Lawrence D'Oliveiro 
In message 874on82oan@benfinney.id.au, Ben Finney wrote:

 Or you could use the ready-made wheel maintained by others:
 
 tzinfo Objects
 URL:http://docs.python.org/library/datetime.html#tzinfo-objects

But that’s only an abstract base class, which means it doesn’t actually 
implement any reading of actual timezone info.

 World timezone definitions, modern and historical
 URL:http://pypi.python.org/pypi/pytz

Shame that they maintain their own duplicate of the Olson database, instead 
of reading the original directly from /usr/share/zoneinfo 
http://www.codecodex.com/wiki/Reading_time_zone_files.
-- 
http://mail.python.org/mailman/listinfo/python-list

DST and datetime

2009-12-30 Thread W. eWatson 

Try this. It works for me and my application.

=Program
from datetime import datetime, timedelta
import time

DST_dict = { # West coast, 8 hours from Greenwich for PST
 2007:(2007/03/11 02:00:00, 2007/11/04 02:00:00),
 2008:(2008/03/09 02:00:00, 2008/11/02 02:00:00),
 2009:(2009/03/08 02:00:00, 2009/11/01 02:00:00),
 2010:(2010/03/14 02:00:00, 2010/11/07 02:00:00)}

def adjust_DST(DT_stamp, spring, fall):
# /mm/dd hh:mm:ss in,
print Date: , DT_stamp
format = '%Y/%m/%d %H:%M:%S'
dt = datetime(*(time.strptime(DT_stamp, format)[0:6])) # get six tuple
dspring = datetime(*(time.strptime(spring, format)[0:6]))
dfall   = datetime(*(time.strptime(fall, format)[0:6]))
if ((dt = dspring) and (dt = dfall)):
printadjustment
adj = timedelta(seconds = 3600)
dt = dt + adj
else:
printno adjustment
format = '%Y/%m/%d %H:%M:%S'
return dt.strftime(format)

print DST Adjustment
print + adjust_DST(2007/03/28 12:45:10, \
2007/03/11 02:00:00, 2007/11/04 02:00:00 )
print + adjust_DST(2009/11/26 20:35:15, \
2007/03/11 02:00:00, 2007/11/04 02:00:00 )

===Results==
ST Adjustment
Date:  2007/03/28 12:45:10
   adjustment
   2007/03/28 13:45:10
Date:  2009/11/26 20:35:15
   no adjustment
   2009/11/26 20:35:15
--
http://mail.python.org/mailman/listinfo/python-list

Re: DST and datetime

2009-12-30 Thread Ben Finney 
W. eWatson wolftra...@invalid.com writes:

 =Program
 from datetime import datetime, timedelta
 import time

 DST_dict = { # West coast, 8 hours from Greenwich for PST
  2007:(2007/03/11 02:00:00, 2007/11/04 02:00:00),
  2008:(2008/03/09 02:00:00, 2008/11/02 02:00:00),
  2009:(2009/03/08 02:00:00, 2009/11/01 02:00:00),
  2010:(2010/03/14 02:00:00, 2010/11/07 02:00:00)}

Or you could use the ready-made wheel maintained by others:

tzinfo Objects
URL:http://docs.python.org/library/datetime.html#tzinfo-objects

World timezone definitions, modern and historical
URL:http://pypi.python.org/pypi/pytz

-- 
 \  “Ignorance more frequently begets confidence than does |
  `\   knowledge.” —Charles Darwin, _The Descent of Man_, 1871 |
_o__)  |
Ben Finney
-- 
http://mail.python.org/mailman/listinfo/python-list