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Calibre's Date field is set to today's date for a new merged book.
Only custom date fields have first/last/newest/oldest options. I would consider also adding a 'today/now' option for custom date fields if that's what you mean.
Setting a specific value to a specific custom field is too... specific. EpubMerge presents you with the Edit Metadata dialog when a new merged book is created for exactly that sort of personal data management.
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