For example - Alerting should be active from 7 am to 6pm Only
Please help me if there is any solutions or any work arounds. Thank you
Hello 
and welcome to the forum, @gopichandh
If you are using legacy alerts, there is a great 3rd party tool for pausing alerts:
If you are using the newer Unified Alerting that is now standard in Grafana 8.2, then this will not work.