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[david (David Taylor)]

Conflict between timezones in "Insert date / time"

I’m afraid the technical reason here is pretty confusing - you can read about it at Moment Timezone | Docs POSIX compatibility requires that the offsets are inverted. Therefore, Etc/GMT-X will have an offset of +X and Etc/GMT+X will have an offset of -X . This is a result of IANA’s Time Zone Database and not an arbitrary choice by Moment.js. Thus, using locality based identifiers is preferred over fixed-offset identifiers. So, in IANA’s Time Zone database, Europe/Oslo is currently equivalent…