This method returns:
{"01/01/07"}
: timestamp as 1 element array {"01/01/07","01/12/07"}
: timespan as 2 element array {null,"01/12/07"}
: open ended (start) timespan as 2 element array {"01/12/07",null}
: open ended (end) timespan as 2 element array {}
: no timestamp information as empty array
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