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https://1for1.life/2018/09/30/i-can-tell-you-from-personal-experience-since-ive-done-it-four-4-times-now-when-you-make-that-15-hour-12-15-time-zone-changes-flight-from-the-usa-to-philippines-and-or-the-other-way-your-body-cl/
I can tell you from personal experience since I've done it four (4) times now, when you make that 15-hour 12-15 time zone changes flight from the USA to Philippines and/or the other way, your body clock is screwed up for about 5 days. I've been whipsawed that way in both directions the past 30 days. :)