'Specific Time at Specific Date in SSRS

I am new to SSRS. I have a dataset that uses a stored procedure. One of my parameters is sources and the other is the timestamp. When the report runs it will give the data of the whole day as the timestamp is 24 hrs.

=Format(Fields!Timestamp.Value, Code.GetDatetimePattern())

How can I limit the time stamp to a specific time like 6:00 AM? I also want to compare this timestamp data with the previous month's timestamp data. For comparison I am using this.

=Code.GetSeriesLabel(Fields!Timestamp.Value, Fields!PeriodType.Value)


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