Add days to date in pandas

Question

I have a data frame that contains 2 columns, one is Date and other is float number. I would like to add those 2 to get the following:

   Index           Date           Days           NewDate
     0           20-04-2016        5           25-04-2016
     1           16-03-2015       3.7          20-03-2015

As you can see if there is decimal it is converted as int as 3.1--> 4 (days). I have some weird questions so I appreciate any help. Thank you !

Answer 1

First, ensure that the Date column is a datetime object:

df['Date'] = pd.to_datetime(df['Date'])

Then, we can convert the Days column to int by ceiling it and the converting it to a pandas Timedelta:

temp = df['Days'].apply(np.ceil).apply(lambda x: pd.Timedelta(x, unit='D'))

Datetime objects and timedeltas can be added:

df['NewDate'] = df['Date'] + temp