R date m/d/y to yyyy-mm-dd -


i trying change date within dataframe correct format within r. (m/d/y correct yyyy-mm-dd).

i have data looks this

    date      time  ph 1   1/4/1981  9:00  3.9  2   1/8/1981  8:30  3.9

etc

the name of data frame working in data.cat.ac

i tried 

data.cat.ac[,1]$date <- as.date(data.cat.ac[,1]$date, "%y/%m/%d")

...but did not work.

i getting error, 

$ operator invalid atomic vectors

any tips or pointers on doing wrong?

when use as.date, should not enter format want output. instead enter format in data.

as.date("1/4/1981", format="%m/%d/%y") [1] "1981-01-04"

we got lucky in case in desired output happens default output. learning purposes, let's wanted format "dd:mm:yyyy". after converting date format did above, use:

format(x2, "%m:%d:%y") [1] "01:04:1981"

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