How do I check to see if a float ends in 0.0 or 0.5?

Question

I am trying to work on a clock face that deals with GMT. If the GMT offset is an even hour, everything works fin. However, I cannot figure out how to check if it off by 30 minutes. Yes. I can divide the number by 3600 to get the hours. I have it formatted to return 1 decimal place (which should always be a 0 or 5). How do I check that number to see if it is a zero or half so that I can act on it? Can someone either answer or point me to a sample where this is successfully done? 
 
 var convSecHr = (clockTime.timeZoneOffset / 3600 * - 1 ). format ( "%.1f" ); 
 //Eastern time returns 4.0 
 //What if it returns 3.5? There has to be some kind of "find the last character and act on it" function.

Thanks, 
 Jeff

Robin_ · Accepted Answer

Normally with this I would use the modulo ( remainder function) and an if statement does if the remainder of you value is greater than 0 you have a half timezone

How do I check to see if a float ends in 0.0 or 0.5?

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