Anyone have success w/STRPTIME???

[Mauro Cicognini]

Benjamin Schollnick wrote:

> On Fri, 08 Oct 1999 15:51:48 +0200, Mauro Cicognini wrote:
>
> >Ben, strptime() is not supported under Windows. It does say so in the
> >docs. :(
>
> I must of missed that...
>
> >If you're interested, I've written a str2time() which I'm pretty much
> >satisfacted with, that does some nice RE processing and a couple crude
> >hacks to get what I want in a Python format. It extracts a date from
> >many general-format strings; if you need to, changing the RE will allow
> >you to parse even more formats. I can send you the source if you wish.
> >
> >Also, a coworker of mine has found a strptime() written in Python (which
> >will work on Windows, too) that does all that the standard strptime()
> >does, and more.
>
> I'd certainly appreciate it if you could send me yours.  If your coworker
> wouldn't mind, I certainly would like to see the strptime replacement,
> so that I can keep the program "general" python compliant.
>
>                         - Benjamin

My source is attached.
The stuff to parse month names is really crude, a better way would be to use
python's 'local' module but I have no time now. I have translated all the
comments, I hope I haven't broken something in the attempt, in case please
fix it, it shouldn't be too difficult.

I noticed on the newsgroup appeared the link to the pure Python strptime(),
so it's best to follow that.

Mauro



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def str2time(d):
	"""
	This function attempts to convert a date expressed in various manners
	in UNIX format (no. of seconds from 1 jan 1970 00:00:00 GMT).

	The general format must contain at least day and month, as follows:
	Day: 1 or 2 digits.
	Month: 1 or 2 digits or at least 3 letters of the name.
	Year: 2 to 4 digits. Optional: if missing the current year is assumed.
	Elements in the date can be separated by '-', '/', '.' or
	by an indefinite number of blanks.
	
	A time figure may be present (even without an explicit year figure).
	If present, it must be separated for the date by at least a blank.
	
	Hours: 1 or 2 digits.
	Minutes: 2 digits.
	Seconds: 2 digits. Optional.
	Elements inside time can be separated by '.' or ':'.
	
	Special formats:
	 - "yesterday": obviously returns yesterday's date
	 - "today": obviously returns today's date
	 - "tomorrow": obviously returns tomorrow's date
	 - A number preceded by '+' or '-': returns the date of the day that comes
	   so many days before (if preceded by '-') or after (if preceded by '-')
	   today, e.g. '+5' means 5 days in the future; '-2' is the day before yesterday;
	   '+2' is the day after tomorrow; etc. For generality, '0' (the digit zero) = today.

	The RE that does most of the work is hereafter commented.
	
	(				# start date section
	    (?P<dy>\d{1,2})		    # dy=day, 1 or 2 digits
	    ([-/.]|\s+)			    # separators: '-', '/', '.' or blanks
	    (?P<mo>\d{1,2}|[a-zA-Z]{3,})    # mo=month, 1 or 2 digits, or an alpha string
	    (				    # start year section, optional
	        ([-/.]|\s+)			# separators: '-', '/', '.' or blanks
	        (?P<yr>\d{2,4}		        # yr=year, 2 to 4 digits
	           (?=\s+|$))		            # "lookahead", blanks or end
	    )?					# end year section
	)				# end date section
	(				# start hour section, optional
	    \s+				    # separators: one or more blanks
	    (?P<hr>\d{1,2})		    # hr=hours, 1 or 2 digits
	    [.:]			    # separators: '.' or ':'
	    (?P<mn>\d{2})		    # mn=minutes, 2 digits
	    (				    # start seconds section, optional
	        [.:]			        # separators: '.' o ':'
	        (?P<sc>\d{2})		        # sc=seconds, 2 digits
	    )?				    # end seconds section
	)?				# end time section
	"""
	
	if d == '':
		return (None)
		
	if d == 'today' or d == '0':
		return (time.time())
	elif d == 'yesterday':
		return (time.time() - 86400)
	elif d == 'tomorrow':
		return (time.time() + 86400)
	elif d[0] == '+' or d[0] == '-':
		try:
			nd = int(d)
		except ValueError:
			return (None)
		return (time.time() + 86400*nd)
	else:
		p = re.compile("((?P<dy>\d{1,2})([-/.]|\s+)(?P<mo>\d{1,2}|[a-zA-Z]{3,})"	# giorno e mese
		               "(([-/.]|\s+)(?P<yr>\d{2,4}(?=\s+|$)))?)"			# anno opzionale
		               "(\s+(?P<hr>\d{1,2})[.:](?P<mn>\d{2})([.:](?P<sc>\d{2}))?)?")	# ore, minuti e secondi (opz.)
		m = p.match(d)
		if m:
			giorno,meseboh,anno,ore,min,sec = m.group("dy","mo","yr","hr","mn","sc")

			if not anno:
				anno = time.localtime(time.time())[0]
			if not ore: ore = 0
			if not min: min = 0
			if not sec: sec = 0
			
			try:
				mese = int(meseboh)
			except ValueError:
				try:
					mese = {'jan':1,'feb':2,'mar':3,'apr':4,'may':5,'jun':6,'jul':7,'aug':8,'sep':9,'oct':10,'nov':11,'dec':12}[meseboh[:3]]
				except KeyError:
					return (None)
		else:
			return (None)
		try:
			return (time.mktime(int(anno),int(mese),int(giorno), int(ore),int(min),int(sec), 0,0,-1))
		except ValueError:
			return (None)
		except OverflowError:
			return (None)
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