After the PST -> PDT change some of the test262 tests are failed. The reason is the wrong daylight saving time. ecma_date_daylight_saving_ta in ecma-builtin-helpers-date.c is get the daylight saving adjustment from the system, but it gets it for the current date and not for the date we must set (e.g.: new Date(1969, 12)).

=== Summary ===
 - Ran 11552 tests
 - Passed 11546 tests (99.9%)
 - Failed 6 tests (0.1%)
Failed tests
  ch15/15.9/15.9.3/S15.9.3.1_A5_T1 in non-strict mode
  ch15/15.9/15.9.3/S15.9.3.1_A5_T2 in non-strict mode
  ch15/15.9/15.9.3/S15.9.3.1_A5_T3 in non-strict mode
  ch15/15.9/15.9.3/S15.9.3.1_A5_T4 in non-strict mode
  ch15/15.9/15.9.3/S15.9.3.1_A5_T5 in non-strict mode
  ch15/15.9/15.9.3/S15.9.3.1_A5_T6 in non-strict mode