JAVASCRIPT TO SWIFT CONVERTER FULL

Then that is the only case when you can use a fixed string as a value for dateFormatter.dateFormat.īUT then ALWAYS also set your dateFormatter.locale to In last resort, if you need to parse a date for an API that doesn’t fall into ISO8601 format,īut that also isn’t intended for UI (and should thus not depend on the user’s locale/region/language), Tip: One of the little-known options of ISO8601DateFormatter is that it is also able to handleįractional seconds if you set it up using (.withFractionalSeconds).Īlways use the en_US_POSIX locale for fixed formats This class is dedicated to handle the ISO8601 standardĪnd all its possible variants and edge cases better than using a custom dateFormat would. Using ISODateFormatter instead of a DateFormatter with a custom dateFormat. If you need to parse ISO8601 dates, consider Working with ISO8601 dates and fixed formats for APIsĪlso has a dedicated section about those cases here. If you still need to use a custom dateFormat, be sure that you useĭtLocalizedDateFormatFromTemplate(…) or dateFormatter.dateFormat = DateFormatter.dateFormat(fromTemplate:…options:…locale:…) instead of setting it to a hard-coded String. Using DateFormatter's templating methods to auto-adjust for the user's Locale I would even advise you to convince your designer against using a custom format and explain them that DateĪnd Time is a tricky subject with lots of edge casesĪnd that it's generally not worth using a custom format that might fit their assumptions about the localeĪnd region they're used to use but might not fit a lot of other's. That you can otherwise miss when using a custom and hardcoded dateFormat.

This is because those are locale-aware and account for a lot of edge cases The main recommendation to follow is to prefer using dateStyle and timeStyle In their documentation about best practices for formatting a date to present to the user in a locale-aware way. Then be sure to also set your dateFormatter.locale to the special value Locale(identifier: 'en_US_POSIX').įormatting user-visible dates for your UI If you can't because your API format doesn't fit ISO8601 and you still absolutely need to use a custom dateFormat, When parsing ISO8601 internet dates, always use ISO8601DateFormatter.If you can't find a fitting dateStyle/timeStyle to format your UI dates, then at least useĭtLocalizedDateFormatFromTemplate(…) to account for the user's locale. Use dateStyle and timeStyle over dateFormat whenever you can.Įxplain the date fallacies to your designer if you need to.

You should be aware that using a custom dateFormat comes with a risk of falling into some fallacies.Įspecially, you need to realize that the user can use different Locales,Īnd that date formats are different for different locales, regions and user settings.įor example one date formatted with a dateFormat that fits the US might become confusing for anyone in Europe. The main fallacy to be aware of: dateFormat is not locale-aware

JAVASCRIPT TO SWIFT CONVERTER FULL

Can also match a literal Z for Zulu (UTC) time.įor the full reference of available format options, see The expanded time zone name, falls back to GMT-08:00 (hour offset) if name is not known. Falls back to GMT-08:00 (hour offset) if the name is not known. The 24-hour hour padding with a zero if there is only 1 digit. The 12-hour hour padding with a zero if there is only 1 digit Year, minimum of four digits (padding with zeros if necessary) Year, two digits (padding with a zero if necessary) The following table’s sample column are mostly based on the time December 14th, 2008 4:35 PM UTC.

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