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""" |
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ETLT |
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Copyright 2016 Set Based IT Consultancy |
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Licence MIT |
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""" |
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import re |
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View Code Duplication |
class DateCleaner: |
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""" |
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Utility class for converting dates in miscellaneous formats to ISO-8601 (YYYY-MM-DD) format. |
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""" |
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# ------------------------------------------------------------------------------------------------------------------ |
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month_map = { |
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# English |
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'jan': '01', |
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'feb': '02', |
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'mar': '03', |
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'apr': '04', |
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'may': '05', |
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'jun': '06', |
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'jul': '07', |
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'aug': '08', |
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'sep': '09', |
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'oct': '10', |
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'nov': '11', |
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'dec': '12', |
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# Dutch |
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'mrt': '03', |
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'mei': '05', |
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'okt': '10' |
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} |
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# ------------------------------------------------------------------------------------------------------------------ |
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@staticmethod |
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def clean(date, ignore_time=False): |
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""" |
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Converts a date in miscellaneous format to ISO-8601 (YYYY-MM-DD) format. |
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:param str date: The input date. |
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:param bool ignore_time: If true any trailing time prt is ignore. |
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:rtype: str |
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""" |
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# Return empty input immediately. |
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if not date: |
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return date |
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parts = re.split(r'[\-/. ]', date) |
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if (len(parts) == 3) or \ |
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(len(parts) > 3 and ignore_time) or \ |
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(len(parts) == 4 and re.match(r'^[0:]*$', parts[3])) or \ |
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(len(parts) == 5 and re.match(r'^[0:]*$', parts[3]) and re.match(r'^0*$', parts[4])): |
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if len(parts[0]) == 4 and len(parts[1]) <= 2 and len(parts[2]) <= 2: |
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# Assume date is in YYYY-MM-DD of YYYY-M-D format. |
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return parts[0] + '-' + ('00' + parts[1])[-2:] + '-' + ('00' + parts[2])[-2:] |
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if len(parts[0]) <= 2 and len(parts[1]) <= 2 and len(parts[2]) == 4: |
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# Assume date is in DD-MM-YYYY or D-M-YYYY format. |
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return parts[2] + '-' + ('00' + parts[1])[-2:] + '-' + ('00' + parts[0])[-2:] |
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if len(parts[0]) <= 2 and len(parts[1]) <= 2 and len(parts[2]) == 2: |
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# Assume date is in DD-MM-YY or D-M-YY format. |
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year = '19' + parts[2] if parts[2] >= '20' else '20' + parts[2] |
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return year + '-' + ('00' + parts[1])[-2:] + '-' + ('00' + parts[0])[-2:] |
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# Try DDmonYYYY or DDmonYYYY HH:mm:ss format |
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pattern = r'^(\d{2})([a-z]{3})(\d{4})' + ('.*$' if ignore_time else r'(\D(\d{1,2})\D(\d{1,2})\D(\d{1,2}))?$') |
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match = re.match(pattern, date.lower()) |
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if match and match.group(2) in DateCleaner.month_map: |
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ret = match.group(3) + '-' + DateCleaner.month_map[match.group(2)] + '-' + match.group(1) |
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if len(match.groups()) == 7 and match.group(4): |
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ret += 'T' + match.group(5) + ':' + match.group(6) + ':' + match.group(7) |
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return ret |
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# Try YYYYMMDD format. |
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pattern = r'^\d{8}' + ('.*$' if ignore_time else '$') |
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match = re.match(pattern, date) |
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if match: |
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# Assume date is YYYYMMDD format |
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return date[0:4] + '-' + date[4:6] + '-' + date[6:8] |
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# Format not recognized. Just return the original string. |
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return date |
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# ---------------------------------------------------------------------------------------------------------------------- |
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PyETLT /
etlt
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