Passing date field throw rest

Hi all,

I am using PHP to write REST query to ES .I am trying to search my ES with a query that contains date field. This is my query:
{"query":{"bool":{"must":{"range":{"timeGenerated":{"from":"2013/4/1 09:14:08","to":"2013/4/1 09:14:08"}}}}}}

When I try this query it gives me no response from server -not empty-. When I remove the time portion from the date, it works!

Also I tried the tow queries from curl command line and it works fine.



I noticed that the REST return an error:
Code: 52
Message: Empty reply from the server

Any help will be appreciated.