如何将前一天晚上的 11:59 PM 和今晚的 12:00 AM 表示为长值???
这么多不同的日期选项我很困惑
you can use this calculation to do so.
//11:59 PM of the previous night and 12:00 AM of tonight
Calendar prevDate = Calendar.getInstance();
if(prevDate.get(Calendar.DATE)==1)
{
if(prevDate.get(Calendar.MONTH)==0)
{
prevDate.set(Calendar.YEAR, prevDate.get(Calendar.YEAR)-1);
prevDate.set(Calendar.MONTH,Calendar.DECEMBER);
prevDate.set(Calendar.DAY_OF_MONTH,31);
}
else
{
prevDate.set(Calendar.MONTH,prevDate.get(Calendar.MONTH)-1);
prevDate.set(Calendar.DAY_OF_MONTH, prevDate.getMaximum(Calendar.DAY_OF_MONTH));
}
}
else
{
prevDate.set(Calendar.DAY_OF_MONTH,prevDate.get(Calendar.DAY_OF_MONTH)-1);
}
prevDate.set(Calendar.HOUR_OF_DAY, 11);
prevDate.set(Calendar.MINUTE, 59);
Calendar currDate = Calendar.getInstance();
currDate.set(Calendar.HOUR_OF_DAY, 0);
currDate.set(Calendar.MINUTE, 0);
long prevDateLong = prevDate.getTimeInMillis();
long currDateLong = currDate.getTimeInMillis();
Log.i("", prevDate.toString()+" >>>>>>>> "+currDate.toString());
Log.i("", prevDateLong+" >>>>>>>>> "+currDateLong);
所有 Java 日期都在下面。这是自 1970 年 1 月 1 日午夜以来的毫秒数。
Date today = new SimpleDateFormat("yyyy-MMM-dd").parse("2012-Oct-28"); // today at midnight
long millis = today.getTime();
我建议你看看java.util.Calendar
课堂。这并不难,只是乏味。