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static extern bool SetLocalTime([In] ref SYSTEMTIME lpLocalTime);

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Shared Function SetLocalTime(ByRef time As SYSTEMTIME) As Boolean

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SetLocalTime only succeeds if the application is running as an administrator.

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    //Sample code for SetLocalTime and SYSTEMTIME structure

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        //SetLocalTime C# Signature

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        public static extern bool SetLocalTime( ref SYSTEMTIME Time );

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            SetLocalTime(ref st);

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   Private Shared Function SetLocalTime(ByRef time As SYSTEMTIME) As Boolean

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     SetLocalTime(currentTime)

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Documentation

[SetLocalTime] on MSDN

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   static extern bool SetLocalTime(ref SYSTEMTIME lpSystemTime);

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   Private Shared Function SetLocalTime(ByRef time As SYSTEMTIME) As Boolean

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     SetLocalTime(ref time2);

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Documentation

[SetLocalTime] on MSDN

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To set the date and time with consideration to the locale settings use SetLocalTime.