Unlike a strict enum check against the typed Timezone list, this validates at runtime via
isValidTimezone (i.e. any valid IANA zone name). It therefore accepts valid IANA names
that aren't in the typed list, such as legacy aliases like 'America/Indianapolis' that some
environments (notably Safari) still report from Intl. The branded Timezone type allows
timezone inputs that are not restricted to the Timezone list.
A shape for a timezone value.
Unlike a strict enum check against the typed Timezone list, this validates at runtime via isValidTimezone (i.e. any valid IANA zone name). It therefore accepts valid IANA names that aren't in the typed list, such as legacy aliases like
'America/Indianapolis'that some environments (notably Safari) still report fromIntl. The branded Timezone type allows timezone inputs that are not restricted to the Timezone list.