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+#! /usr/bin/env python
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+# Date manipulation examples
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+
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+# https://datagy.io/python-string-to-date/
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+# https://stackoverflow.com/questions/12566152/python-x-days-ago-to-datetime
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+
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+from datetime import datetime
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+from dateutil.relativedelta import relativedelta
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+
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+
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+date_string = '2021-12-31'
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+then = datetime.strptime(date_string, '%Y-%m-%d')
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+print(f"then: {then}")
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+
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+now = datetime.now()
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+print(f"now: {now}")
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+
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+diff = now - then
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+print(diff)
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+
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+# minus 1 year
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+
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+oneYearAgoDate = datetime.now() - relativedelta(years=1)
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+
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+oneYearAgoString = oneYearAgoDate.strftime('%Y-%m-%d')
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+
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+print(oneYearAgoString)
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