Noticed in testing on an unlaunched WP.com site:

Unexpected double dates on the front-end in the post-meta.
cc @obenland
I'd consider that a theme issue, see _s: https://github.com/Automattic/_s/blob/master/style.css#L850
I'll fix this with the other theme style updates.
The fix for this was removed in the review cycle of https://github.com/Automattic/themes/pull/1710. Re-opening.
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I'll fix this with the other theme style updates.