[HACKERS] Re: Datetime regression tests are all failing

[Thomas Lockhart]

Fixes committed.

                     - Thomas

Fix up "Postgres-style" time interval representation when fields have
 mixed-signs. Previous effort left way too many minus signs, and was at
 least as broken as the one before that :(
Clean up "ISO-style" time interval representation to omit zero fields if
 there is at least one non-zero field. Supress some leading plus signs
 when not necessary for clarity.
Replace every #ifdef __CYGWIN__ block with a cleaner TIMEZONE_GLOBAL
macro
 defined in datetime.h.