Datetime from year and week number

Question

I have a year and a week number which I want to convert into a datetime.datetiem object. My (naive?) reading of the documentation hinted that strptime('2016 00', '%Y %W') should do just that. However:

In [2]: from datetime import datetime

In [3]: datetime.strptime('2016 00', '%Y %W')
Out[3]: datetime(2016, 1, 1, 0, 0)

In [4]: datetime.strptime('2016 52', '%Y %W')
Out[4]: datetime(2016, 1, 1, 0, 0)

What am I doing wrong?

Answer 1

So it turns out that the week number isn't enough for strptime to get the date. Add a default day of the week to your string so it will work.

> from datetime import datetime
> myDate = "2016 51"
> datetime.strptime(myDate + ' 0', "%Y %W %w")
> datetime.datetime(2016, 12, 25, 0, 0)

The 0 tells it to pick the Sunday of that week, but you can change that in the range of 0 through 6 for each day.