ios - 将字符串日期值转换为当前时间的日期

Question

将字符串格式日期值转换为日期类型时，时区始终设置为上午 12:00 将“2021-12-04”转换为日期时如何设置为设备的当前时间？

func stringToDateConvertion(date: String, format: String) -> Date {
    let dateFormatter = DateFormatter()
    dateFormatter.locale = Locale.init(identifier: "en_US_POSIX")
    dateFormatter.timeZone = TimeZone.init(abbreviation: "UTC")
    dateFormatter.dateFormat = format
    if let startDate = dateFormatter.date(from: dateStr) {
        return startDate as Date
    }
    return Date() as Date
}
let dateValue = "2021-12-04"
stringToDateConvertion(date:dateString, format: "YYYY-MM-dd")

结果 dataString 值为

 2021-12-04 00:00:00 +0000
  - timeIntervalSinceReferenceDate : 660268800.0

如何显示当前时间值“04:37:39 +0000”后修复到日期值。