def __init__(self, base=1, month=1, day=1, tz=None):
"""
mark years that are multiple of base on a given month and day
(default jan 1)
"""
DateLocator.__init__(self, tz)
self.base = Base(base)
self.replaced = { 'month' : month,
'day' : day,
'hour' : 0,
'minute' : 0,
'second' : 0,
'tzinfo' : tz
}
