[R] Replace / with - in date

[prem_R]

Thanks Mr.Winsemius  for the proposed solution ,it worked fine.But when came
to the entire data frame containing 400000 rows ,i used the following code
as proposed by you 

a$date1<-gsub("/","-",a$date)

got the following error:
Error in `$<-.data.frame`(`*tmp*`, "date1", value = character(0)) : 
  replacement has 0 rows, data has 441906

Please provide solution with the problem.

Thanks.
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