'Split the TZ from string.
@param s: A string containing a timezone
@type s: basestring
@return: The split parts.
@rtype: tuple'

@classmethod
def split(cls, s):

    m = cls.pattern.search(s)
    if (m is None):
        return (s,)
    x = m.start(0)
    return (s[:x], s[x:])
