how can check the time?

I have a stored procedure and I want to run a command based on time so if the time is after 8pm the charge the client US$ 10 otherwise US$ 8

Code Snippet

charge = case when datepart(hour, getdate())>=20 then 10 else 8 end

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That covers it up to midnight. Most likely you will also want to continue past midnight up to some early morning time.

If so, then something like this: (building on phdiwakar's suggestion) to charge $10 between 8 PM and 6 AM

Code Snippet

Charge = CASE
WHEN ( datepart( hour, getdate()) >= 20
OR datepart( hour, getdate()) <= 5
) THEN 10
ELSE 8
END