How to check the license status and expiration time of the license on an S series switch

For S series switches (except the S1700), run the display license state command to query the license status and remaining validity period of the license.
display license state Info: Current license state is Demo. 293 days remain.
The system supports the following license states:
Normal: normal license
Demo: demonstration license
Trial: trial license that has expired but is still valid during the trial period
Emergency: emergency license
Default: no activated license or expired license

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