bug#30722: parse-time-string fails on Windows for some values.

[Eli Zaretskii]

> From: Jacob MacDonald <jaccarmac@gmail.com>
> Date: Tue, 06 Mar 2018 00:46:22 +0000
> 
> To reproduce: On a Windows version of Emacs:
> 
> Evaluate (parse-time-string "2018-03-05")
> 
> A list of all nils is returned.

In what version of Emacs do you see this?  I cannot reproduce neither
in the current emacs-26 branch nor on master.