r - Convert from character to Date -

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i running date issues when working dates in r.

here's situation-

i have data set based on dates , got date field converted character date in r using following code 

o1$date <- as.date(o1$date , "%m/%d/%y")

(my dataset o1 , date name of date column)

my date column has following values 

"1/1/2013"  "1/1/2014"  "1/10/2013" "1/10/2014" "1/11/2013" "1/11/2014"

however when convert char date following dates 

"2020-01-01" "2020-01-01" "2020-01-10" "2020-01-10" "2020-01-11"

any suggestions on problem , how work around it?

look @ ?strptime see formatting options times , dates. need use %y rather %y 2 digit year.


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