def date_to_sim_days(date): return DataTable.subtract_dates(date, "2013-12-15")
def date_to_sim_days(date): return DataTable.subtract_dates(date, "2015-05-01")
def date_to_sim_days(date): return DataTable.subtract_dates(date,"2012-02-29")
def date_to_sim_days(date): return DataTable.subtract_dates(date, "2013-12-15")
def date_to_sim_days(date): return DataTable.subtract_dates(date, "2015-05-01")
def date_to_sim_days(date): return DataTable.subtract_dates(date,"2012-02-29")