Error importing date from ODS file

[msaby]

Describe the bug

A date in a cell in a ODS file is imported as a "java.util.GregorianCalendar" and displayed as

 java.util.GregorianCalendar[time=1546297200000,areFieldsSet=true,areAllFieldsSet=true,lenient=true,zone=sun.util.calendar.ZoneInfo[id="Europe/Paris",offset=3600000,dstSavings=3600000,useDaylight=true,transitions=184,lastRule=java.util.SimpleTimeZone[id=Europe/Paris,offset=3600000,dstSavings=3600000,useDaylight=true,startYear=0,startMode=2,startMonth=2,startDay=-1,startDayOfWeek=1,startTime=3600000,startTimeMode=2,endMode=2,endMonth=9,endDay=-1,endDayOfWeek=1,endTime=3600000,endTimeMode=2]],firstDayOfWeek=2,minimalDaysInFirstWeek=4,ERA=1,YEAR=2019,MONTH=0,WEEK_OF_YEAR=1,WEEK_OF_MONTH=1,DAY_OF_MONTH=1,DAY_OF_YEAR=1,DAY_OF_WEEK=3,DAY_OF_WEEK_IN_MONTH=1,AM_PM=0,HOUR=0,HOUR_OF_DAY=0,MINUTE=0,SECOND=0,MILLISECOND=0,ZONE_OFFSET=3600000,DST_OFFSET=0] |  

To Reproduce

Create a ODS file with Libreoffice

Put a date in a cell (like 1/1/2000)

Import into openrefine

Current Results
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Expected behavior
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Screenshots
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Desktop (please complete the following information):

• OS: Win10
• Browser Version: Chrome
• JRE or JDK Version: 1.8.0.231

OpenRefine (please complete the following information):

• Version : OpenRefine 3.3 Beta

Datasets
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Additional context
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[wetneb]

Related: #533 proposes to add support for storing dates (without time) in cells.

[wetneb]

Clearing milestone since PR is abandoned

[tfmorris]

This likely has the same root cause as #1908 and is another regression which was introduced by the Java 8 Date/Time changes in OpenRefine 3.0, as described in #1908 (comment).

[tfmorris]

Although I changed this to an OffsetDateTime, which is what OpenRefine currently uses internally, using LocalDateTime might be more appropriate since OpenOffice Calc doesn't have the concept of timezones.