55c3a04d60
In HEAD, fix incorrect field width for hours part of OF when tm_gmtoff is negative. This was introduced by commit 2d87eedc1d4468d3 as a result of falsely applying a pattern that's correct when + signs are omitted, which is not the case for OF. In 9.4, fix missing abs() call that allowed a sign to be attached to the minutes part of OF. This was fixed in 9.5 by 9b43d73b3f9bef27, but for inscrutable reasons not back-patched. In all three versions, ensure that the sign of tm_gmtoff is correctly reported even when the GMT offset is less than 1 hour. Add regression tests, which evidently we desperately need here. Thomas Munro and Tom Lane, per report from David Fetter
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