Change date field until minute to zero for group by

[suhyunjeon]

I got date fields like this.

{
   date:"2013-11-01T16:14:55.372Z",
   latency:1
},
{
   date:"2013-11-01T16:14:00.372Z",
   latency:6
},
{
   date:"013-11-01T16:15:17.496Z",
   latency:3
}

I want to see the count to group by the date field(until minutes)  like
that.

{
   date:"2013-11-01T16:14:55.372Z",
   latency:6
},
{
   date:"013-11-01T16:15:17.496Z",
   latency:3
}

So I have to change the date field format to Raw Query Parameters. 

How do I do? Help me please. It didn't work.

My Raw Query Parameters :
group=true&group.field=log_ts_tdt&group.facet=true&group.func=rint(div(ms(log_ts_tdt),mul(24,mul(60,mul(60,1000)))))




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