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Datetime updates

nmartensen requested to merge topic/3.0/datetime_updates into branch/3.0

This MR has two parts:

  1. Round datetimes returned by from_excel() to milliseconds, which according to the specification is the recommended baseline precision.
  2. Deserialize 1 to 1900-01-01 (instead of 1899-12-31) in the 1900 date system, to avoid jumping dates when moving to 1+ε, and to increase compatibility with Excel.
Edited by nmartensen

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