Issue #13644 has been reported by MSP-Greg (Greg L).

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Bug #13644: Windows - Setting Time.now
https://bugs.ruby-lang.org/issues/13644

* Author: MSP-Greg (Greg L)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
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While reviewing a MinGW build `test-all` failure in [TestLogDevice#test_shifting_midnight_exist_file](https://github.com/ruby/ruby/blob/trunk/test/logger/test_logdevice.rb#L687-L727), I determined the cause.  The test in question (and other tests that seem to have newer/better exception handling) sets `Time.now`.

The thread [StackOverflow - Change system date programmatically](https://stackoverflow.com/questions/650849/change-system-date-programmatically) seems to imply that in some instances/configurations, changing the system time on Windows systems requires elevated permissions.

I tested on both a mswin build (`ruby 2.5.0dev (2017-05-27 trunk 58922) [x64-mswin64_140]`) and a MinGW build (`ruby 2.5.0dev (2017-06-08 trunk 59046) [x64-mingw32]`), and both responded to:

```ruby
Time.now = Time.mktime(2017, 1, 3, 1, 1, 1)
```

with the following eror:

```
undefined method `now=' for Time:Class (NoMethodError)
```

Both also had `false = Time.respond_to?(:now=)`.

So, I'm confused as to how this test passes on mswin.  Regardless, the test requires a skip to bypass it and allow MinGW test-all to pass.

I thought I'd file an issue before doing a PR.  I'm building and testing on Win7.  Finally, if anyone has time, where is the method `now=` defined?



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