This is my sample data
2000/01/01
2000/01/01
2000/02/01
2000/10/01
2000/19/01
2000/20/01
2000/21/01
2000/22/01
2000/23/01
2000/25/01
2000/26/01
2000/27/01
2000/28/01
2000/29/01
Tried using levels function but got the following error .
Error in levels(a$date) <- gsub("/", "-", levels(a$date)) :
attempt to set an attribute on NULL
Thanks.
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