RFR: 8282769: BSD date cannot handle all ISO 8601 formats

[Magnus Ihse Bursie]

The BSD version of the date command that ships with macOS cannot handle all ISO 8601 formats. More specifically, it cannot handle trailing milliseconds.

This fix will allow it to be more tolerant.

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Commit messages:
 - 8282769: BSD date cannot handle all ISO 8601 formats

Changes: https://git.openjdk.java.net/jdk/pull/7733/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=7733&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282769
  Stats: 7 lines in 1 file changed: 0 ins; 2 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/7733.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/7733/head:pull/7733

PR: https://git.openjdk.java.net/jdk/pull/7733