Unix date Format (MON)

Shell Programming and Scripting
1

Hi , Can any one give me what is the date format for 3 character Month all caps (MON)

when I do date +%b it will give me Sep
But I want this to be SEP (all caps) .

Thanks in advance

2 
mymonth=`echo $(date +%b) | tr '[a-z]' '[A-Z]'`;echo $mymonth

or

echo $(date +%b) | tr '[a-z]' '[A-Z]'