You can choose from the following options:

• Date and Time of Day: This will be good to configure when you troubleshoot a network with time-dependent events, for example, when you know about an event that happens at specific times, and you want to look at what happens on the network at the same time.
• Seconds Since...: Time in seconds since January 1, 1970. Epoch is an arbitrary date chosen as a reference time for a system, and January 1, 1970 was chosen for Unix and Unix-like systems.
• Seconds Since Beginning of Capture: The default configuration.

• Seconds Since Previous Captured Packet: This is also a common feature that enables you to see time differences between packets. This can be useful when monitoring time-sensitive traffic such as TCP connections, live video streaming, VoIP calls, and so on when time differences between packets is important.
• Seconds Since Previous Displayed Packet: This is a useful feature that can be used when you configure a display filter, and only a selected part of the captured data is presented (for example, a TCP stream). In this case, you will see the time difference between packets, which can be important in some applications.
• UTC Date and Time of Day: Provides relative UTC time.

The lower part of the submenu provides the format of the time display. Change it only if a more accurate measurement is required.

You can use also Ctrl + Alt + any numbered digit key on the keyboard for the various options.