Need to block ICMP Type 13 (Timestamp Request) and Type 14 (Timestamp Reply) traffic in DFW.
VMware NSX
Navigate to Inventory > Services > Add Service > Mention the name and click 'SET' > ADD Service Entry > Mention the service entry name and select ICMPV4 in service type and then select timestamp request (No code ) and timestamp reply (No code) in additional properties >Apply
Select the service mentioned in the "Service entry name" in the rule where you want to block ICMP Timestamp Type 13 and 14 in DFW.