(1) You are redirecting all output to
date-cron.log, (2) you aren't even trying to pass text to your mail command (&& vs |).
Assuming you want just the email:
Code:
00 16 * * 1-5 bash /home/amar/RoutineBackupTest.sh | mail -s "Backup Log for `date +\%d_\%m_\%Y_\%H_\%M`" my.email@company.com