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And, if the OP doesn't have a Linux system, but does have a 1993 or later ksh, the following works correctly when $t_date expands to a YYYYMMDD representation of the last day of any month:
printf...

$ awk ' /BEGIN/,/END/ { str = str ? str "\n" $0 : $0 } /END/ { if( str ~ /Amit/ ) { print str }; str = "" } ' file
******** BEGIN *****
My name is Amit.
I am learning unix.
***** END *****

...

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That might be due to buffering. On linux, one of the coreutils is stdbuf that allows to modify the way programs use their input and output buffers. Try:tail -f /var/log/syslog | stdbuf -o0 grep...

You do not need to put date, ls, or any other COMMAND to put in quotes when executed in a terminal.

Just like this is enough:
date
ls
w

To actualy work with them, it is suggest to echo them...

This depends on a recent shell and GNU date:awk '{print $3"-"$2"-"$1" "$4":"$5}' FS="[-: ]" file4 |
date -f- +%s |
{ read OLDP
printf "%(%d-%m-%Y %H:%M)T, " $OLDP; CNT=1 ...