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The condition FNR==NR will be true only for the FIRST file passed to awk for processing. Therefore, we read file2 into hash FIRST - then proceed with the processing for the other/file1 files.

/^[0-9]{2}\//{f=0}

If the first 2 characters of the line are numeric and the third character is a slash (the next date) assign 0 to the variable f.

awk 'BEGIN{printf("Enter the date : "); getline date < "-"} $0 ~ date{f=1}!NF{f=0}f' file