Use the SET statement to set a variable to the date required, then rename the file:
//JOB (ABC)...,CLASS=T,MSGCLASS=T
//*
// SET THEDATE=022704
//*
//DELETE EXEC PGM=IEFBR14
//FILE1 DD DSN=MYHLQ.NODE2.NODE3.D&THEDATE,
// DISP=(MOD,DELETE,DELETE)
//*
//RENAME EXEC PGM=IEBGENER...