Current date" is the current date, you can't change that -- well, you could change the current date in your computer and that revised date would be picked up. And there is no way to completely hide the current date line.
If you want, you can add an additional line that will vary according to your requirements.[ul]
[li]In right hand Gantt display, RightMouseButton, select Gridlines, choose "Status Date" and set the properties for Type and Color.[/li]
[li]In the menu bars, click on Project > Project Information and look for "Status Date". Set that to the appropriate date and you're done.[/li]
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You can hide this line later on by going back to Project > Project Information and setting the Status Date to "NA" (no quotes).