See #113 (comment)
Timezone information of time fields is ignored, e.g. if COMPLETED:;TZID=Europe/Brussels:20180418T150001 is parsed, it won't store the timezone.
This also looks like a bug, it might be from all the arrow mess that i have to clean. I'll look into it (but feel free to open an issue with code example if you want to)
Might be that #68 is not yet fixed ? :o