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If you write the 2009/04/03 - is it the fourth day of March or the third of April?
The log package uses YYYY/MM/DD - so the order is the one it should be, but the separators make it look like it could be different.

The ISO 8601 uses dashes - as separators, so most developers, libraries and tools see 2009-04-03 and recognize the ISO format.
Why does Go differ from the international standard?
There is no logical reason for that, so it should be changed.