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Yes you can specify any numeric start number for your matters.

How do I import a Date, Time and Memo data field?

When importing custom data, either participant or action data you might want to populate a date and time or a date, time and memo field. When doing this enter in the date a space and the time in the column on your csv file. If you want to add a memo then it should be followed immediately with a vertical slash "|" and the memo. For example:

To enter a time and date use the format:

2016-04-16 14:22:22

To enter a time, date and memo format:

2016-04-16 14:22:22|example memo