import pandas as pd

def empty(start, end, cols):
	df = pd.DataFrame(0, index=pd.date_range(start=start, end=end), columns=cols)
	df.index = pd.MultiIndex.from_tuples([(a.year, a.month, a.day) for a in df.index], names=['year', 'month', 'day'])
	return df

empty('1/1/2010', '1/2/2018', ['a', 'b'])