Compare Pandas Datetimeindex To A Smaller Datetimeindex With Condition

I am trying to compare two Pandas DatetineIndexs with different lengths. I want to simply add a new column to my larger Dataframe (df) and place 1 where it matches the smaller Dat

Solution 1:

tEvents and df.index are different lengths. df.index == tEvents looks to compare the two lists.

You want to check if an element in df.index is in tEvents. Thus replace df.index == tEvents with df.index.isin(tEvents)

To see add a True or false value if date matches, use DataFrame.isin()