not familiar with the helper but you need to pass the TimeZone to IntlDateTimeFormat always, so either timezone comes from context or in the helper they always pass the timezone.
each site (Mexico, Brazil, USA) use a default timezone, of course if they don't provide it then you can use UTC.
not familiar with the helper but you need to pass the TimeZone to IntlDateTimeFormat always, so either timezone comes from context or in the helper they always pass the timezone.
each site (Mexico, Brazil, USA) use a default timezone, of course if they don't provide it then you can use UTC.