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Re: datetime question

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On Tue, Nov 12, 2013 at 8:32 AM, Ferrous Cranus <nikos.gr33k@gmail.com> wrote:
> Στις 12/11/2013 2:47 μμ, ο/η Andy Lawton έγραψε:
>>
>> Firstly , I should clarify I have no idea how to program python, I
>> joined this mailing list in anticipation of learning soon. And
>> thought I'd have a go playing around with your code and code given to
>> you (worst possible place to start, I'm sure)
>>
>> But from the answers already given to you, this seems to work and as you
>> requested, in reality, this keeps your code to 1 line...
>>
>> I'm sure this is wrong, and isn't what you want, but hey, Correct
>> working code doesn't seem to matter to you anyway...
>>
>> (I think "Europe/Kiev" is Greece but I don't know)
>>
>> from datetime import datetime, time, timedelta
>> import time
>> import pytz
>>
>> def is_dst(zonename):
>>      tz = pytz.timezone(zonename)
>>      now = pytz.utc.localize(datetime.utcnow())
>>      return now.astimezone(tz).dst() != timedelta(0)
>>
>> def dst_greece():
>>      if is_dst("Europe/Kiev") :
>>          diff = 2
>>      else:
>>          diff = 3
>>      return diff
>>
>> lastvisit = (datetime.utcnow() +timedelta(hours=dst_greece())).strftime(
>> '%y-%m-%d %H:%M:%S' )
>>
>>
>> On 12 November 2013 10:15, Ferrous Cranus <nikos.gr33k@gmail.com
>> <mailto:nikos.gr33k@gmail.com>> wrote:
>>
>>     Στις 8/11/2013 11:11 μμ, ο/η Νίκος Αλεξόπουλος έγραψε:
>>
>>         Is there someway to write the following line even better with the
>>
>>         ability to detect daylight saving time by itself so i don't have
>> to
>>         alter the line manually when time changes?
>>
>>         lastvisit = ( datetime.utcnow() + timedelta(hours=2) ).strftime(
>>         '%y-%m-%d %H:%M:%S' )        # MySQL datetime format
>>
>>         Thanks.
>>
>>
>>
>>     Example:
>>
>>     #check if date entered as intented, format it properly for MySQL
>>     lastvisit = datetime.strptime(lastvisit, '%d %m
>>     %Y').strftime('%Y-%m-%d')
>>
>>     The above code gets the datetime string in a specific way and then
>>     convert it to another format. All happens in one line clear and
>> simple.
>>
>>     Now, in the following statement there shopuld be some way to check
>>     for daylight saving time so i would aboiut add +2 in winter or +3
>>     for greek summer time.
>>
>>
>>     lastvisit = ( datetime.utcnow() + timedelta(hours=2) ).strftime(
>>     '%y-%m-%d %H:%M:%S' )          # MySQL datetime format
>>
>>     I think + timedelta(hours=2) should be substituted with something
>>     else but i don't with what.
>>     --
>>     https://mail.python.org/__mailman/listinfo/python-list
>>     <https://mail.python.org/mailman/listinfo/python-list>
>>
>>
>
>
> this requires a function to be declared while i just want just an argument
> inside timedelta( ) that will automatically detect DST or not.
>
> No function declaration but instead something like:
> lastvisit = ( datetime.utcnow() + timedelta( some_arg_here_that_can detect
> greece's_DST_or_not) ).strftime)     '%y-%m-%d %H:%M:%S' )    # MySQL
> datetime format
>
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list

I think that is a great solution.  What would happen if you just did this:
lastvisit2 = (datetime.now()).strftime('%y-%m-%d %H:%M:%S' )

Why don't you try it out and see what you find?

(PS, this was pointed out to me by a pro, so I did a little reading in
the python docs and took Andy's excellent code and added a couple of
lines to test.)

I switched to my local timezone "US/Eastern" to test. My machine is
running Ubuntu.  It seems to know that it is in the Eastern US.  If
your server knows where it lives, then this should work for you also.
If it is set to a different timezone, I'm not sure I could help you,
but I'm sure someone could.  You even might ask your host if this is
possible.

----------------------
#! /usr/bin/env python

from datetime import datetime, time, timedelta
import time
import pytz

def is_dst(zonename):
     tz = pytz.timezone(zonename)
     now = pytz.utc.localize(datetime.utcnow())
     return now.astimezone(tz).dst() != timedelta(0)

def dst_greece():
     #if is_dst("Europe/Kiev") :
     if is_dst("US/Eastern") :
         diff = -6
     else:
         diff = -5
     return diff

lastvisit = (datetime.utcnow()
+timedelta(hours=dst_greece())).strftime('%y-%m-%d %H:%M:%S' )

lastvisit2 = (datetime.now()).strftime('%y-%m-%d %H:%M:%S' )

print lastvisit
print lastvisit2

----------------------


-- 
Joel Goldstick
http://joelgoldstick.com

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datetime question Νίκος Αλεξόπουλος <nikos.gr33k@gmail.com> - 2013-11-08 23:11 +0200
  Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-08 21:29 +0000
    Re: datetime question Νίκος Αλεξόπουλος <nikos.gr33k@gmail.com> - 2013-11-09 00:01 +0200
      Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-08 17:06 -0500
        Re: datetime question rurpy@yahoo.com - 2013-11-11 14:49 -0800
          Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-11 18:18 -0500
      Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-08 22:18 +0000
      Re: datetime question Grant Edwards <invalid@invalid.invalid> - 2013-11-08 22:29 +0000
        Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-09 09:39 +1100
          Re: datetime question Roy Smith <roy@panix.com> - 2013-11-09 10:30 -0500
        Re: datetime question Gene Heskett <gheskett@wdtv.com> - 2013-11-09 10:39 -0500
        Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-10 09:25 +1100
      Re: datetime question Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-08 22:49 +0000
        Re: datetime question Νίκος Αλεξόπουλος <nikos.gr33k@gmail.com> - 2013-11-09 01:02 +0200
          Re: datetime question Robert Kern <robert.kern@gmail.com> - 2013-11-08 23:23 +0000
          Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-09 10:30 +1100
          Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-09 00:12 +0000
          Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-09 12:45 +0000
            Re: datetime question Νίκος Αλεξόπουλος <nikos.gr33k@gmail.com> - 2013-11-09 15:43 +0200
              Re: datetime question unknown <unknown@unknown.com> - 2013-11-10 12:52 +0000
          Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-09 23:52 +1100
  Re: datetime question Gene Heskett <gheskett@wdtv.com> - 2013-11-09 19:55 -0500
  Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-10 19:47 +1100
  Re: datetime question Gene Heskett <gheskett@wdtv.com> - 2013-11-10 04:13 -0500
  Re: datetime question Νίκος Αλεξόπουλος <nikos.gr33k@gmail.com> - 2013-11-11 11:57 +0200
    Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-11 08:41 -0500
      Re: datetime question Roy Smith <roy@panix.com> - 2013-11-11 09:14 -0500
        Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-12 01:25 +1100
        Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-11 09:36 -0500
        Re: datetime question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-11 20:59 -0500
        Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-12 13:02 +1100
        Re: datetime question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-11 21:02 -0500
        Re: datetime question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-12 19:30 -0500
        Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-13 11:40 +1100
    Re: datetime question Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-11 19:19 +0000
      Re: datetime question Ethan Furman <ethan@stoneleaf.us> - 2013-11-11 11:39 -0800
        Re: datetime question Grant Edwards <invalid@invalid.invalid> - 2013-11-11 20:45 +0000
        Re: datetime question mm0fmf <none@mailinator.com> - 2013-11-11 23:21 +0000
          Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-11 23:48 +0000
            Re: datetime question Grant Edwards <invalid@invalid.invalid> - 2013-11-12 04:49 +0000
              Re: datetime question alex23 <wuwei23@gmail.com> - 2013-11-12 17:25 +1000
                Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-12 18:35 +1100
                Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-12 09:20 +0000
              Re: datetime question Roy Smith <roy@panix.com> - 2013-11-12 09:18 -0500
  Re: datetime question Ferrous Cranus <nikos.gr33k@gmail.com> - 2013-11-12 12:15 +0200
    Re: datetime question Andy Lawton <andy@andylawton.eu> - 2013-11-12 12:47 +0000
      Re: datetime question Ferrous Cranus <nikos.gr33k@gmail.com> - 2013-11-12 15:32 +0200
        Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-12 09:03 -0500
          Re: datetime question Ferrous Cranus <nikos.gr33k@gmail.com> - 2013-11-12 16:12 +0200
            Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-13 01:57 +1100
              Re: datetime question Ferrous Cranus <nikos.gr33k@gmail.com> - 2013-11-12 17:24 +0200
                Re: datetime question Tim Chase <python.list@tim.thechases.com> - 2013-11-12 09:54 -0600
                Re: datetime question Ferrous Cranus <nikos.gr33k@gmail.com> - 2013-11-12 17:57 +0200
                Re: datetime question Tim Chase <python.list@tim.thechases.com> - 2013-11-12 10:12 -0600
                Re: datetime question William Ray Wing <wrw@mac.com> - 2013-11-12 11:14 -0500
                Re: datetime question Mark Lawrence <breamoreboy@yahoo.co.uk> - 2013-11-12 16:30 +0000
                Re: datetime question MRAB <python@mrabarnett.plus.com> - 2013-11-12 19:09 +0000
                Re: datetime question Joel Goldstick <joel.goldstick@gmail.com> - 2013-11-12 14:14 -0500
                Re: datetime question Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-12 19:24 +0000
                Re: datetime question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-12 19:38 -0500
                Re: datetime question Chris Angelico <rosuav@gmail.com> - 2013-11-13 09:42 +1100
                Re: datetime question Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2013-11-12 19:37 -0500
                Re: datetime question MRAB <python@mrabarnett.plus.com> - 2013-11-13 01:08 +0000
                Re: datetime question Alister <alister.ware@ntlworld.com> - 2013-11-12 16:11 +0000
                Re: datetime question Roy Smith <roy@panix.com> - 2013-11-12 19:43 -0500
      Re: datetime question Denis McMahon <denismfmcmahon@gmail.com> - 2013-11-12 19:20 +0000

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