Get summer/winter time from PHP timezone library #103
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Thanks for the PR! I think it is a good one, since it can now be used by other Holiday Providers as well. Always love a good refactor :) |
stelgenhof
reviewed
Mar 17, 2018
| $transition = array_shift($transitions); | ||
| $dst = $transition['isdst']; | ||
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| foreach ($transitions as $transition) { |
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It seems you rely on the fact that the getTransitions function returns the transitions sorted by time, correct? If returned randomly, I think getting the transitions for summer and wintertime then might not work this way.
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AFAICT from the PHP source code, we can rely on the dates being returned in chronological order. It seems the underlying data structure is also sorted by date.
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Travis is happy now :-) |
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The date of transition to/from daylight saving time, and whether daylight saving time has been used at all, has changed over the years. This information is available in the tz (Olson) database that is included in PHP.
This PR makes Yasumi use the tz database for calculating the transitions. This works for any timezone that observes daylight saving time.
It seems that PHP currently only supports years until 2037 (when Unix timestamps exceed 31 bits), but this will likely be fixed in due time, if daylight saving time exists at all at that time.