Enhance my redirect script

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is is possible to redirect visitors by date.
The problem: I am forced to use a site builder my domain and i dont
like site builders very much.
in my site builder, after i enter a html code, i have to press <save>,
then i have to press <publish> in order to save a code that i typed.

If i add the code below in site builder and when i press <save>, it
immediately goes to google.com without giving me a chance to <publish>
my page. When i comeback, the old stuff is in there. the code that i
typed disappears.

So, here is what i thought.Today is may 29th. i want to make this code
valid with if else statement only after may 30th. Is it possible to do

<script type="text/javascript">
window.location = "http://www.google.com/"

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