Describe the bug
In Discover, if choose "Today" for time range, csv report couldn't generate. The request will not even be successfully sent to backend for execution.

• Error log in browser

  context_menu_helpers.js:47 Uncaught TypeError: Cannot read property 'diff' of undefined
      at getTimeFieldsFromUrl (context_menu_helpers.js:47)
      at HTMLButtonElement.<anonymous> (context_menu.js:163)
      at HTMLDocument.dispatch (jquery.js:5429)
      at HTMLDocument.elemData.handle (jquery.js:5233)
  

• Root Cause
  If set to "Today", we fail to get time range from url, becuase in the time field of url, it will be

  ....time:(from:now%2Fd,to:now%2Fd))...
  

• Comparing to for example "Last 24 hours"

  time:(from:now-24h,to:now)
  

The logic actually converting start and end time to absolute data and time, then calculate the math diff and use as timeduration in ISO format. But for Today case, the converted time range will be same for start and end.

To Reproduce
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4. See error

Expected behavior
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