Date transformation Format R -


i have column in df 

date 1992 1992 1992 1992 1993 1993 1993

it integer or factor , transfomed date 

reshaped.test1$year <- as.date(as.factor(reshaped.test1$year), "%y")

but out put 

 date 1992/03/28 1992/03/28 1992/03/28 1992/03/28 1993/03/28 1993/03/28

the class (df$date) date fund solution tojust maintain year 

df$date <- format(f,'%y')

but class changed

this problem same work in q monthly frequent date


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