Previously, an input string ends with short timezone spec e.g. WET, was parsed by setting $TZ environment variable to the timezone. But the timezone might be different from the original local timezone, thus the result might not follow the timezone change in the original local timezone. This makes the check of the short timezone spec with tzname[] earlier, then it is not necessary to load another timezone file for e.g. WET, and provides expected time. This also make it use SAVE_TIMEZONE macro and drop use of forking process. This makes greatly improve performance when parsing string that contains timezone different from the current local timezone. Unfortunately, there is still one corner case that our test fails. When tzdata is built with rearguard enabled, then at least Africa/Windhoek timezone does not provide correct time, but time shifted 1 hour from the original.
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