#!/usr/bin/env python

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import re

def _convert_pattern(pattern):

    # patterns from http://www.unicode.org/reports/tr35/#Date_Format_Patterns

    qt_regexps = {

        r"yyy{3,}" : "yyyy", # more that three digits hence convert to four-digit year

        r"L" : "M",          # stand-alone month names. not supported.

        r"g{1,}": "",        # modified julian day. not supported.

        r"S{1,}" : "",       # fractional seconds. not supported.

        r"A{1,}" : ""        # milliseconds in day. not supported.

    }

    qt_patterns = {

        "G" : "", "GG" : "", "GGG" : "", "GGGG" : "", "GGGGG" : "", # Era. not supported.

        "y" : "yyyy", # four-digit year without leading zeroes

        "Q" : "", "QQ" : "", "QQQ" : "", "QQQQ" : "", # quarter. not supported.

        "q" : "", "qq" : "", "qqq" : "", "qqqq" : "", # quarter. not supported.

        "MMMMM" : "MMM", # narrow month name.

        "LLLLL" : "MMM", # stand-alone narrow month name.

        "l" : "", # special symbol for chinese leap month. not supported.

        "w" : "", "W" : "", # week of year/month. not supported.

        "D" : "", "DD" : "", "DDD" : "", # day of year. not supported.

        "F" : "", # day of week in month. not supported.

        "E" : "ddd", "EE" : "ddd", "EEE" : "ddd", "EEEEE" : "ddd", "EEEE" : "dddd", # day of week

        "e" : "ddd", "ee" : "ddd", "eee" : "ddd", "eeeee" : "ddd", "eeee" : "dddd", # local day of week

        "c" : "ddd", "cc" : "ddd", "ccc" : "ddd", "ccccc" : "ddd", "cccc" : "dddd", # stand-alone local day of week

        "a" : "AP", # AM/PM

        "K" : "h", # Hour 0-11

        "k" : "H", # Hour 1-24

        "j" : "", # special reserved symbol.

        "z" : "t", "zz" : "t", "zzz" : "t", "zzzz" : "t", # timezone

        "Z" : "t", "ZZ" : "t", "ZZZ" : "t", "ZZZZ" : "t", # timezone

        "v" : "t", "vv" : "t", "vvv" : "t", "vvvv" : "t", # timezone

        "V" : "t", "VV" : "t", "VVV" : "t", "VVVV" : "t"  # timezone

    }

    if qt_patterns.has_key(pattern):

        return qt_patterns[pattern]

    for r,v in qt_regexps.items():

        pattern = re.sub(r, v, pattern)

    return pattern

def convert_date(input):

    result = ""

    patterns = "GyYuQqMLlwWdDFgEecahHKkjmsSAzZvV"

    last = ""

    inquote = 0

    chars_to_strip = " -"

    for c in input:

        if c == "'":

            inquote = inquote + 1

        if inquote % 2 == 0:

            if c in patterns:

                if not last:

                    last = c

                else:

                    if c in last:

                        last += c

                    else:

                        # pattern changed

                        converted = _convert_pattern(last)

                        result += converted

                        if not converted:

                            result = result.rstrip(chars_to_strip)

                        last = c

                continue

        if last:

            # pattern ended

            converted = _convert_pattern(last)

            result += converted

            if not converted:

                result = result.rstrip(chars_to_strip)

            last = ""

        result += c

    if last:

        converted = _convert_pattern(last)

        result += converted

        if not converted:

            result = result.rstrip(chars_to_strip)

    return result.lstrip(chars_to_strip)