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MTS=$(awk -v m=$MONTHEND 'BEGIN{printf( "%.2i\n",index(" JanFebMarAprMayJunJulAugSepOctNovDec", m )/3 )}')

The index() function returns the index of m (the given month) in the string of the 1st...

Alternatively, a case...esac sh statement can be used. No real need to bother with external tools such as sed, awk, et al.

case $MONTHEND in
Jan) MTS=01;;
Feb) MTS=02;;
Mar)...

Instead of 12 sed commands:
MTS=$(awk -v m=$MONTHEND 'BEGIN{printf( "%.2i\n",index(" JanFebMarAprMayJunJulAugSepOctNovDec", m )/3 )}')

That's because you are using the $MONTHEND var in each assignment. The last one always gets assigned to MTS. You should change the $MONTHEND to $MTS and start with assigning $MONTHEND to MTS (ie. 1st...