Configuring the timestamp format using the CLI

This topic describes how to use CLI commands to specify the syslog timestamp format. For a full list of logging commands and the usage and parameters, see the CLI Command Reference.

Prerequisites

Admin access

To configure the timestamp format used in log messages:

Go to CLI configuration mode:

hostname > enable
hostname # configure terminal

Enter the logging fields timestamp format <format> command, where <format> is one of the following:
- rfc-3164—Use the timestamp format specified in RFC-3164 (for example, May 13 15:12:01).
- rfc-3339—Use the timestamp format specified in RFC-3339 (for example, 2017-05-15T15:22:33).
The following example specifies that all log messages use RFC-3339 format:
```
hostname (config) # logging fields timestamp format rfc-3339
```

Verify your changes:

hostname (config) # show logging
   Local logging level:                err

   Remote syslog default level:        notice
   No remote syslog servers configured.

Receive remote messages via UDP:       no

Receive remote messages via TCP:       no

Receive remote messages via TLS:       no

Log file rotation:
   Log rotation size threshold:        256 megabytes
   Archived log files to keep:         40

Log format:
   Timestamp format:                   rfc-3339

   Subsecond timestamp field:          disabled

Secure channel logs:                   no

Save your changes.
```
hostname (config) # write memory
```