一、效果图

图1，中国的时间格式


图2，美国的时间格式

二、StringUtil.kt代码

import java.text.DateFormat
import java.text.SimpleDateFormat
import java.util.*
object StringUtil {

    fun formatTimestamp(currentTime: Long): String {
        var sdf = SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
        return sdf.format(Date(currentTime))
    }

    fun formatDateTimeLocale(
        timeMillis: Long?,
        dateStyle: Int = DateFormat.SHORT,
        timeStyle: Int = DateFormat.SHORT
    ): String {
        if (timeMillis == null || timeMillis <= 0L) {
            return ""
        }
        try {
            val locale = Locale.getDefault()
            val dateFormat = DateFormat.getDateInstance(dateStyle, locale)
            val timeFormat = DateFormat.getTimeInstance(timeStyle, locale)
            val calendar: Calendar = Calendar.getInstance(locale)
            calendar.time = Date(timeMillis)
            val formattedDate = dateFormat.format(calendar.time)
            var formattedTime = timeFormat.format(calendar.time)
            return "$formattedDate $formattedTime"
        } catch (e: Exception) {
      
        }
        return ""
    }
}