sed command issue

Karthikeyan <[email protected]> Thu, 29 Nov 2018 12:28:57 +0530

Newsgroups	gmane.comp.gnu.utils.bugs
Message-ID	<CAMQ5_3GUcqaBoYm8UKPY0gE_BE0mJ3KPJ3ZbS4RtgV1WQevBLw@mail.gmail.com>

Hi Team,

While executing the below sed command I am not getting output of timestamp
log but its working on other linux server. Could you please help me on this
issue?.

sed -n '/20:42:01/,/20:50:59/p' log.txt

Regards
Karthikeyan M