Pandas offset DatetimeIndex to next business if date is not a business day

Question

I have a DataFrame which is indexed with the last day of the month. Sometimes this date is a weekday and sometimes it is a weekend. Ignoring holidays, I\'m looking to offset

Answer 1

You can add 0*BDay()

from pandas.tseries.offsets import BDay
df.index = df.index.map(lambda x : x + 0*BDay())

You can also use this with a Holiday calendar with CDay(calendar) in case there are holidays.

Answer 2

You can map the index with a lambda function, and set the result back to the index.

df.index = df.index.map(lambda x: x if x.dayofweek < 5 else x + pd.DateOffset(7-x.dayofweek))

df
            A
2015-04-30  0
2015-06-01  0
2015-06-30  0

Answer 3

Using DataFrame.resample

A more idiomatic method would be to resample to business days:

df.resample('B', label='right', closed='right').first().dropna() 

              A
2015-04-30  0.0
2015-06-01  0.0
2015-06-30  0.0