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from random import random
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from datetime import datetime, timedelta
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import time
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import hive
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def ds_add(ds, days):
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'''Add or subtract days from a YYYY-MM-DD'''
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ds = datetime.strptime(ds, '%Y-%m-%d')
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if days:
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ds = ds + timedelta(days)
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return ds.isoformat()[:10]
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