Created
August 8, 2022 15:07
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The "Etc/GMT+3" time zone ID actually refers to "-03:00", as demonstrated here
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| import java.time.ZoneId | |
| import java.time.format.DateTimeFormatterBuilder | |
| import java.time.temporal.TemporalQueries | |
| def parseZoneId(input: String): ZoneId = | |
| new DateTimeFormatterBuilder() | |
| .appendZoneId | |
| .toFormatter | |
| .parse(input) | |
| .query(TemporalQueries.zoneId) | |
| val plus3 = parseZoneId("+03:00") | |
| // val plus3: java.time.ZoneId = +03:00 | |
| plus3.normalized | |
| // val res0: java.time.ZoneId = +03:00 | |
| val gmtPlus3 = parseZoneId("GMT+03:00") | |
| // val gmtPlus3: java.time.ZoneId = GMT+03:00 | |
| gmtPlus3.normalized | |
| // val res1: java.time.ZoneId = +03:00 | |
| val etcGmtPlus3 = parseZoneId("Etc/GMT+3") | |
| // val etcGmtPlus3: java.time.ZoneId = Etc/GMT+3 | |
| etcGmtPlus3.normalized | |
| // val res2: java.time.ZoneId = -03:00 | |
| /* | |
| "In order to conform with the POSIX style, | |
| those zone names beginning with "Etc/GMT" have their sign reversed from the standard ISO 8601 convention." | |
| https://en.wikipedia.org/wiki/Tz_database#Area | |
| */ |
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