Can anyone tell me how to write the following SQL code in Oracle?

select
convert(datetime,convert(varchar,datepart(month,da teadd(month, -1,getdate())))+'/01/'+convert(varchar,datepart(year,getdate()-1)))as Start_Month,
convert(datetime,convert(varchar,datepart(month,ge tdate()))+'/01/'+convert(varchar,datepart(year,getdate()-1)))-1 as End_Month