Add IANA timezone validation constraint (IGO-35)#104
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Implement it.IsTimezone with optional WithZone regional filter, validate.Timezone, and is.Timezone aligned with Symfony Timezone. Uses time.LoadLocation and rejects non-IANA names like Local and EST. Co-authored-by: Igor Lazarev <strider2038@yandex.ru>
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Summary
Adds IANA timezone validation aligned with Symfony
Timezone:it.IsTimezone()with optionalWithZone()regional filtervalidate.Timezone()withWithTimezoneZone()andTimezoneZone*constantsis.Timezone()boolean helpervalidation.ErrInvalidTimezonewith English and Russian translationsValidation uses
time.LoadLocationand accepts canonical IANA identifiers (UTCorRegion/City). Implementation-specific names (Local,Factory) and bare abbreviations (EST,GMT) are rejected.Also closes IGO-33 (Currency) in Linear — already implemented in the codebase.
Test plan
go test -race ./...golangci-lint runtest/constraints_date_time_test.govalidate/timezone_test.goit/example_test.go,validate/example_test.go,is/example_test.go