title: Getting VWAP volume over date and time using Bloomberg Java API
body: <p>I am trying to use the open Bloomberg API to gather the VWAP volume on a specific date for a specific time range.  For example, how can I get the VWAP_VOLUME between 11AM and 11:15AM on August 27th?</p>
  
  <p>Using Excel, I can use </p>
  
  <p><code>BDP("MSFT US Equity", "VWAP_VOLUME", "VWAP_START_TIME=11:00:00", "VWAP_END_TIME=11:15:00", "VWAP_START_DT=20120827", "VWAP_END_DT=20120827")</code></p>
  
  <p>Since I can do it in Excel, it stands to reason that I should be able to do the same thing in Java.  I've tried using a ReferenceDataRequest with overrides for the date and time fields.  I also tried using a HistoricalDataRequest with the overrides set on the time fields.  Neither returns with any data.  How can I do this?</p>