sfactor sfactor - 4 months ago 32
Python Question

How do I round datetime column to nearest quarter hour

I have loaded a data file into a Python pandas dataframe. I has a datetime column of the format

2015-07-18 13:53:33.280

What I need to do is create a new column that rounds this out to its nearest quarter hour. So, the date above will be rounded to
2015-07-18 13:45:00.000

How do I do this in pandas? I tried using the solution from here, but get an
'Series' object has no attribute 'year'


Assuming that your series is made up of datetime objects, You need to use Series.apply . Example -

import datetime
df['<column>'] = df['<column>'].apply(lambda dt: datetime.datetime(dt.year, dt.month, dt.day, dt.hour,15*(dt.minute // 15)))