[Toybox] [PATCH] date: some fixes.

[enh]

Add support for more input formats, primarily the ISO formats used by
the AOSP build.

Also, our interpretation of @UNIXTIME was wrong: surprisingly, it should
respect $TZ.

I've improved/added to the tests a bit to cover these changes, and to
explain the reasons for the various remaining test failures (none of
which are regressions caused by this patch).
---
 tests/date.test   | 49 +++++++++++++++++++++++++++++++----------------
 toys/posix/date.c | 37 ++++++++++++++++++++++++++++-------
 2 files changed, 62 insertions(+), 24 deletions(-)
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