>Dear Experts
>
>Please correct this command line
>

>a=alltrim(substr(str(YEAR(date())),1,4))
>

>I want to extract last two characters of year i.e. 05
>
>Please help

Check the help on str()

&& breaking it down gives

? str(YEAR(date())) && returns a string of length 10, six spaces and 2005
?substr(str(YEAR(date())),1,4)  && results in 4 blanks
?alltrim(substr(str(YEAR(date())),1,4)) && returns the empty string

either
?substr(str(YEAR(date()),4),3,2)

or 
?substr(dtos(date()),3,2)