[jdk13u-dev] RFR: 8250636: iso8601_time returns incorrect offset part on MacOS

[Sergey Nazarkin]

This backport aligns jdk13 with jdk16/11/8. Backport of 8251365 is required after this patch

-------------

Commit messages:
 - Backport 1d480a7b96005f049c1dcb16344ca48f86f01f91

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/52/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=52&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8250636
  Stats: 35 lines in 1 file changed: 14 ins; 19 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/52.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/52/head:pull/52

PR: https://git.openjdk.java.net/jdk13u-dev/pull/52