swift - swift 以大写字母显示 AM/PM

Question

我编写了以下代码以特定格式显示日期时间:

let formatter = NSDateFormatter()
formatter.dateStyle = NSDateFormatterStyle.LongStyle
formatter.timeStyle = .MediumStyle
formatter.dateFormat = "HH:mm a 'on' MMMM dd, yyyy"
let dateString = formatter.stringFromDate(newDate!)
println(dateString)

输出

12:16 pm on July 17, 2015

我想将“pm”显示为“PM”(大写字母)，如果电话有 24 小时格式，则不应显示 AM/PM。请帮我。

Answer 1

您可以按如下方式设置 DateFormatter amSymbol 和 pmSymbol:

Xcode 8.3 • Swift 3.1

let formatter = DateFormatter()
formatter.locale = Locale(identifier: "en_US_POSIX")
formatter.dateFormat = "h:mm a 'on' MMMM dd, yyyy"
formatter.amSymbol = "AM"
formatter.pmSymbol = "PM"

let dateString = formatter.string(from: Date())
print(dateString)   // "4:44 PM on June 23, 2016\n"