[CENTOS] Get the last day of the specified month

YEAR=2014
MONTH=12
date -d${MONTH}/01/${YEAR}-1days+1month '+%Y%m%d'

20141231

from datetime import date, timedelta
from dateutil.relativedelta import relativedelta
year = 2014
month = 12
print date(year, month , 1) + relativedelta(months=1) + timedelta(days=-1)

2014-12-31

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