To get back date date, you may specify the date range in the request's Conditions. Below are the sample of Corporate Actions request and result. Some rows do not match.

{
  "ExtractionRequest": {
    "@odata.type": "#ThomsonReuters.Dss.Api.Extractions.ExtractionRequests.CorporateActionsStandardExtractionRequest",
    "ContentFieldNames": [
        "RIC",
        "Capital Change Ex Date",
        "Capital Change Event Type",
        "Actual Adjustment Factor",
        "New Shares Terms",
        "Old Shares Terms",
        "Capital Change Event Type Description"
    ],
    "IdentifierList": {
      "@odata.type": "#ThomsonReuters.Dss.Api.Extractions.ExtractionRequests.InstrumentIdentifierList",
      "InstrumentIdentifiers": [{
        "Identifier": "000001.SZ",
        "IdentifierType": "Ric"
      }]
    },
    "Condition": {
      "ReportDateRangeType": "Range",
      "QueryStartDate": "1990-01-01T00:00:00.000Z",
      "QueryEndDate": "2017-11-09T00:00:00.000Z",
      "ExcludeDeletedEvents": true,
      "IncludeCapitalChangeEvents": true,
      "IncludeDividendEvents": false,
      "IncludeEarningsEvents": false,
      "IncludeMergersAndAcquisitionsEvents": false,
      "IncludeNominalValueEvents": false,
      "IncludePublicEquityOfferingsEvents": false,
      "IncludeSharesOutstandingEvents": false,
      "IncludeVotingRightsEvents": false,
      "CorporateActionsCapitalChangeType": "CapitalChangeExDate",
      "CorporateActionsDividendsType": "DividendPayDate",
      "CorporateActionsEarningsType": "PeriodEndDate",
      "ShareAmountTypes": [
      ]
    }
  }
}

RIC,Capital Change Ex Date,Capital Change Event Type,Actual Adjustment Factor,New Shares Terms,Old Shares Terms,Capital Change Event Type Description
000001.SZ,1996/05/27,43,.5,10,10,Non-renounceable scrip issue in same stock
000001.SZ,1993/05/24,71,.518138,9.5,10,Complex capital change
000001.SZ,2007/06/20,43,1,1,10,Non-renounceable scrip issue in same stock
000001.SZ,2000/11/06,13,.873533,3,10,Non-renounceable rights issue in same stock
000001.SZ,1997/08/25,43,.666667,5,10,Non-renounceable scrip issue in same stock
000001.SZ,1995/09/25,43,.833333,2,10,Non-renounceable scrip issue in same stock
000001.SZ,1994/07/11,71,.638999,6,10,Complex capital change
000001.SZ,2014/06/12,43,.833333,2,10,Non-renounceable scrip issue in same stock
000001.SZ,2015/04/13,43,.833333,2,10,Non-renounceable scrip issue in same stock
000001.SZ,2007/06/20,33,,,,Return of capital
000001.SZ,2013/06/20,80,.625,6,10,"Stock dividend, same stock"
000001.SZ,2008/10/31,43,.769231,3,10,Non-renounceable scrip issue in same stock
000001.SZ,2016/06/16,43,.833333,2,10,Non-renounceable scrip issue in same stock

With regard to data availability, I have found the following information in the User Guide for Tick History 11.2 GUI