java 返回時間相差時長(x天x時x分)
dateDiff(datetime1, datetime2, "yyyy-MM-dd HH:mm:ss");
private String dateDiff(String startTime, String endTime, String format) {
// 按照傳入的格式生成一個simpledateformate對象
String result = "";
SimpleDateFormat sd = new SimpleDateFormat(format);
long nd = 1000 * 24 * 60 * 60;// 一天的毫秒數
long nh = 1000 * 60 * 60;// 一小時的毫秒數
long nm = 1000 * 60;// 一分鐘的毫秒數
long ns = 1000;// 一秒鐘的毫秒數
long diff;
long day = 0;
long hour = 0;
long min = 0;
long sec = 0;
// 獲得兩個時間的毫秒時間差異
try {
diff = sd.parse(endTime).getTime() - sd.parse(startTime).getTime();
day = diff / nd;// 計算差多少天
hour = diff % nd / nh + day * 24;// 計算差多少小時
min = diff % nd % nh / nm + day * 24 * 60;// 計算差多少分鐘
sec = diff % nd % nh % nm / ns;// 計算差多少秒
// 輸出結果
// System.out.println("時間相差:" + day + "天" + (hour - day * 24) + "小時"
// + (min - day * 24 * 60) + "分鐘" + sec + "秒。");
// System.out.println("hour=" + hour + ",min=" + min); ;
if (day > 0) {
result += day + "d";
}
if (hour > 0) {
result += (hour - day * 24) + "h";
}
if (min > 0) {
result += (min - day * 24 * 60) + "m";
}
if(day==0&&hour==0&&min==0)
{
result="0m";
}
} catch (Exception e) {
}
return result;
}