def __year_match(self, t1, t2, tolerance_years=0):
"""
Extracts and compares two years.
Possible inputs: 31/12/2005, 2008
:param t1: record from file containing ["date"] field
:param t2: record from file containing ["date"] field
:param tolerance_years: tolerate margin in years
:return: are dates equal?
"""
y1 = ExtractionUtils.parse_date(t1.get("date")).get("year")
y2 = ExtractionUtils.parse_date(t2.get("date")).get("year")
return ExtractionUtils.date_equals(y1, y2, tolerance_years)
