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#----------------------------------------------------------------------------
# Name: datetimeparser.py
#
# Purpose: - Instantiate datetime.datetime/date instance from a string
# date representation.
# Uses dateutil from http://labix.org/python-dateutil.
#
# - Creates string representation of datetime/date instance.
#
#
# Author: Simon Toens
#
# Created: 28-Feb-06
# CVS-ID:
# Copyright: (c) 2005 ActiveGrid, Inc.
# License: wxWindows License
#----------------------------------------------------------------------------
import datetime
try:
import dateutil.parser
DATEUTIL_INSTALLED = True
except ImportError:
DATEUTIL_INSTALLED = False
ISO_8601_DATE_FORMAT = "%Y-%m-%d"
ISO_8601_TIME_FORMAT = "%H:%M:%S"
ISO_8601_DATETIME_FORMAT = "%s %s" %(ISO_8601_DATE_FORMAT,
ISO_8601_TIME_FORMAT)
DEFAULT_DATETIME = datetime.datetime(1, 1, 1, 0, 0, 0, 0)
def format(dateobj, formatstr=None):
if (formatstr != None and _isDateTimeObject(dateobj)):
return dateobj.strftime(str(formatstr))
return str(dateobj)
def parse(datestr, formatstr=None, asdate=False, astime=False):
"""Instantiates and returns a datetime instance from the datestr datetime
representation.
Optionally, a format string may be used. The format is only loosely
interpreted, its only purpose beeing to determine if the year is first
or last in datestr, and whether the day is in front or follows the
month. If no formatstr is passed in, dateutil tries its best to parse
the datestr. The default date format is YYYY-mm-dd HH:SS.
If asdate is True, returns a date instance instead of a datetime
instance, if astime is True, returns a time instance instead of a
datetime instance."""
dayfirst, yearfirst = _getDayFirstAndYearFirst(formatstr)
rtn = None
try:
if DATEUTIL_INSTALLED:
rtn = dateutil.parser.parse(str(datestr), fuzzy=True,
dayfirst=dayfirst, yearfirst=yearfirst,
default=DEFAULT_DATETIME)
else:
rtn = DEFAULT_DATETIME
except:
rtn = DEFAULT_DATETIME
if (asdate and isinstance(rtn, datetime.datetime)):
rtn = datetime.date(rtn.year, rtn.month, rtn.day)
elif (astime and isinstance(rtn, datetime.datetime)):
rtn = datetime.time(rtn.hour, rtn.minute, rtn.second, rtn.microsecond)
return rtn
def _isDateTimeObject(obj):
return (isinstance(obj, datetime.datetime) or
isinstance(obj, datetime.date) or
isinstance(obj, datetime.time))
def _getDayFirstAndYearFirst(formatstr):
dayFirst = False
yearFirst = False
gotYear = False
gotMonth = False
gotDay = False
if (formatstr == None):
formatstr = ""
for c in formatstr:
if (c.lower() == "y"):
if (gotYear):
continue
if (not gotDay and not gotMonth):
yearFirst = True
gotYear = True
elif (c.lower() == "m"):
if (gotMonth):
continue
if (not gotDay):
dayFirst = False
gotMonth = True
elif (c.lower() == "d"):
if (gotDay):
continue
if (not gotMonth):
dayFirst = True
gotDay = True
return dayFirst, yearFirst
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