Dear R helpers.

I am new to plotting time data using R.
wonder how to convert character time info into date in R.
I searched over the web but did not find answer.

the input character string is something like 03_1993 or 03-1993, so the
precision is at month level.  I tried the following but failed.
#R code below.

 strptime(c("03_1993"),"%m_%Y")
strptime(c("03-1993"),"%m-%Y")

Can you someone kindly show me to do it?

Many thanks in advance!

-Sean

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