How to change the format of abbreviated month with a ending dot in my software R? -

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i peruvian , i'm learning program in r

when convert character date using function as.date na. because abbreviated month not have point (jul. sep.)

fecha<-c("06-jul-2015","06-sep-2012")

as.date(fecha, format="%d-%b-%y")

[1] na na

please. how can r consider abbreviated month without point?

thank much

i had same problem yesterday. added following line 

sys.setlocale("lc_time", "c") fecha<-c("06-jul-2015","06-sep-2012") as.date(fecha, format="%d-%b-%y")

and works: 

"2015-07-06" "2012-09-06"

edit: spanish , dot in comment: 

sys.setlocale("lc_time","spanish") fecha<-c("06-ene.-2015","06-dic.-2012") as.date(fecha, format="%d-%b.-%y")

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