英文:
How to subtract using datetime in py
问题
我有一个数据集，想要创建一个新的列，该列从start_Date列往前看90天。我尝试了两种方法，都导致了类型错误。
df['prior_date'] = df['start_Date'] - 90
我还尝试了
df['prior'] = (df['start_Date'] - dt(days=90)).strftime('%Y-%m-%D')
有关如何使创建的列prior正常工作的建议吗？谢谢。
英文:
I have a dataset and would like to create a new column that looks 90 days back from the start_Date column. I have tried two ways and both cause a typeError.
df['prior_date'] = df['start_Date'] - 90
And I tried
df['prior'] = (df['start_Date')] - dt(days = 90)).strftime('%Y-%m-%D')
Any suggestions on how to have the created column prior work? Thank you
答案1
得分: 1
使用pandas的timedelta方法：
df['prior_date'] = df['start_Date'] - pd.Timedelta(90, "d")
英文:
Use pandas' timedelta method:
df['prior_date'] = df['start_Date'] - pd.Timedelta(90, "d")
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