Explore the key differences between pandas' datetime64[ns] and Timestamp types for efficient data science operations with time series data.

(While datetime supports the years 1 to 9999.) But it's awkward that timestamps generated by datetime.timestamp() don't round-trip (even approximately, for the related issue about loss of millisecond ...

The function _datetime_from_microseconds() below is expecting a timedelta which it adds to the _EPOCH value... listed below. As shown on the wikipedia page above, epoch for each of the Julian Days ...