具有自定义月份名称的 DateFormat

Question

I have a list of 12 month names, let's say ['AAA', 'BBB', ...] . In reality, they are kind of historical, so not included in any typical locale.

Now I want them to be included into my DateFormat('yMMMMd') instead of the normal names. I am not able to build the date string manually like

var myDateStr = myMonthName + ' ' + myDay + ', ' + myYear; // US
var myDateStr = myDay + '. ' + myMonthName + ' ' + myYear; // DE

because I want to keep the format of the chosen locale n.netheless. The day/month/year order changes with the chosen locale, which I want to keep. I just want to replace the month name. A RegExp replace or similar is not easily possible, I guess, because of the different date formats and language specific month names.

Expected result:

• For chosen US locale: AAA 1st, 2022
• For chosen DE locale: 1. AAA 2022
• of course, every other locale format must be supported...

Do you have any ideas?

Is it possible to just insert custom month names into DateFormat object?

Answer 1

I recently had an idea, which seems to work:

var dateStr = DateFormat('yMMMMd', myLocale).format(myDate);
var monthName = DateFormat('MMMM', myLocale).format(myDate);

return dateStr.replaceFirst(monthName, 'AAA');
// or
return dateStr.replaceFirst(monthName, myHistoricalNames[myDate.month - 1]);

1. First create the normal date string to receive the locale's date format.
2. Calculate another date string which only includes the locale's month name. Now I know the string which I need to replace in dateStr no matter which language I choose.
3. Replace the month name with my custom month name.