I have a simple data set which has a date column and a value column. I noticed that the date sometimes comes in as mmddyy (%m/%d/%y) format and other times in mmddYYYY (%m/%d/%Y) format. What is the best way to standardize the dates so that i can do other calculations without this formatting causing issues?
I tried the answers provided here Changing date format in R
and here How to change multiple Date formats in same column
Neither of these were able to fix the problem.
Below is a sample of the data
Date, Market
12/17/09,1.703
12/18/09,1.700
12/21/09,1.700
12/22/09,1.590
12/23/2009,1.568
12/24/2009,1.520
12/28/2009,1.500
12/29/2009,1.450
12/30/2009,1.450
12/31/2009,1.450
1/4/2010,1.440
When i read it into a new vector using something like this
dt <- as.Date(inp$Date, format="%m/%d/%y")
I get the following output for the above segment
dt Market
2009-12-17 1.703
2009-12-18 1.700
2009-12-21 1.700
2009-12-22 1.590
2020-12-23 1.568
2020-12-24 1.520
2020-12-28 1.500
2020-12-29 1.450
2020-12-30 1.450
2020-12-31 1.450
2020-01-04 1.440
As you can see we skipped from 2009 to 2020 at 12/23 because of change in formatting. Any help is appreciated. Thanks.