A faster strptime?

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Is factor 7 lot enough? 

datetime.datetime.strptime(a, '%Y-%m-%d').date()       # 8.87us

datetime.date(*map(int, a.split('-')))                 # 1.28us

EDIT: great idea with explicit slicing:

datetime.date(int(a[:4]), int(a[5:7]), int(a[8:10]))   # 1.06us

that makes factor 8.

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