Flutter intl DateFormat.jm() returns 24-hour instead of 12-hour

DateFormat.yMEd("zh_CN").add_jm();

DateFormat.yMEd("zh_CN").add_Hm();

both return 24-hour format,

but changed to "en_US" return right format.

You can test like

print(DateFormat.jm("en").format(DateTime.now()));
print(DateFormat.Hm("en").format(DateTime.now()));

work well

print(DateFormat.jm("zh").format(DateTime.now()));
print(DateFormat.Hm("zh").format(DateTime.now()));

not working

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