#2458: correct date in in "Simfactory Done" message

Comment (by Bill Gabella):

Testing on my laptop, with Pull Request changes and with the gcc 10 patches. I see the done timestamp when…

sim create-run helloworld gives the right timestamp.

```restructuredtext INFO (HelloWorld): Hello World!

Done. + echo Stopping: + date Stopping: Fri 11 Sep 2020 10:29:07 AM CDT + echo Done. Done. Simfactory Done at date: Fri 11 Sep 2020 10:29:07 AM CDT ```
sim create-submit the poisson gallery example, which fails (unable to allocate some memory) BUT prints out the date-time correctly.

```restructuredtext -> Refusing to allocate 60840728 bytes (60.841 MB) of memory for type CCTK_REAL8. 12230150056 bytes (12230.150 MB) are currently allocated in 1311 objects. The parameter file specifies a maximum of 12288 MB Simfactory Done at date: Fri 11 Sep 2020 11:06:25 AM CDT

```

‌