conditional sum for Greater than

[#1]

I am trying to do a conditional sum for greater than a certain date using the following syntax but it is not working, any ideas? thank you in advance.

Sum({<report_time >='2013-08-10 11:59:00'>} hours)

(sum of hours when report time is after 11:59 on 8/10)

[Clever_Anjos · Accepted solution]

Sum({<report_time ={">2013-08-10 11:59:00"}>} hours)

[#3]

Perfect. THANKS