I have a file with following sample text. (The actual text is huge).
2014/05/08-19:15:44.544824- 2014/05/08-19:21:54.544824- 2014/0
Using a perl one-liner. Capture the time and then just compare.
perl -ne '$t = /(\d+:[\d:.]+)/ ? $1 : undef; print if $t ge "19:15:00" && $t le "19:20:00";' file.txt