如何使用 R 计算这两个日期之间的差异？

Question

I have a data set which containing 2 columns with dates with the following formats:

"2027-02-20 00:00:00 CET"    and "2014-12-31 CET"

how can I calculate the difference between these two dates? Or, how can I apply difftime ?

Here is a useful discussion but I cannot apply it directly?!

I gave by myself the link (above see: Here is blue) where one can find a very similar problem but not exact the same. Unfortunately some of people do not read the question carefully. Just one gave a useful hint. One dose not need any string manipulation!

Answer 1

I solved my problem, the hint of Roland was really useful. I did not really need any string manipulation. If I apply

difftime(strptime("2027-02-20 00:00:00 CET", format = "%Y-%m-%d"),
         strptime("2014-12-31 CET", format = "%Y-%m-%d"),units="weeks")

it works well.