timendaGain 

If you can give me a quote of price and yield for a 10 year on a Monday or Friday then I can run a test now using the same date as the settlement date. I can't find historical prices for the cash note online... only historical yields. If not then I'll run a test on Friday and get back to you then.

OK
will do on Friday and Monday

rleplae 

Did you test it on a Monday and on a Friday ?

Testing today ( Friday ):
10:22 AM EST DST ( New York, daylight savings time )
Bloomberg price: 98.56, yield 2.41%
MarketWatch price: 98 18/32, yield 2.413%
Me: plug in price: 98.56, get yield 2.415&

minute ago :

timendaGain 

Testing today ( Friday ): 10:22 AM EST DST ( New York, daylight savings time ) Bloomberg price: 98.56, yield 2.41% MarketWatch price: 98 18/32, yield 2.413% Me: plug in price: 98.56, get yield 2.415&

You should be close enough

Would be a good day to test, as there is a long weekend for settlement ;-)