__DATE__ is in the wrong format for std.datetime.Date.from*

[dlangBugzillaToGithub]

jurily reported this on 2019-07-09T09:15:29Z

Transfered from https://issues.dlang.org/show_bug.cgi?id=20038

CC List

• razvan.nitu1305

Description

I wanted to reproduce a Webpack feature of not working on Monday. I feel this should be enough:

```
int main(string[]) {
        import std.datetime;
        static assert(Date.fromSimpleString(__DATE__).dayOfWeek != DayOfWeek.mon);
        return 0;
}
```

Instead there's an error:

```
$ rdmd scratch.d
/data/data/com.termux/files/usr/bin/../include/d/std/datetime/date.d(7766): Error: uncaught CTFE exception core.time.TimeException("Invalid string format: Jul  9 2019"c)
scratch.d(3):        called from here: fromSimpleString("Jul  9 2019")
scratch.d(3):        while evaluating: static assert(cast(int)fromSimpleString("Jul  9 2019").dayOfWeek() != 1)
Failed: ["/data/data/com.termux/files/usr/bin/ldmd2", "-v", "-o-", "scratch.d", "-I."]
```

[dlangBugzillaToGithub]

razvan.nitu1305 commented on 2023-04-18T12:04:49Z

This is not a compiler issue, rather than a phobos one. std.datetime lacks the functionality to transform a compiler provided date into an internal representation.