'Mark years that are multiple of base on a given month and day
(default jan 1).'

def __init__(self, base=1, month=1, day=1, tz=None):

    DateLocator.__init__(self, tz)
    self.base = ticker.Base(base)
    self.replaced = {u'month': month, u'day': day, u'hour': 0, u'minute': 0, u'second': 0, u'tzinfo': tz}
