样例 1

1. <span>
2. 本站已运行
3. </span>
4. <span id="span_dt_dt">
5. </span>
6. <script>
7. /*建站时间*/
8. function show_date_time() {
9. window.setTimeout("show_date_time()", 1e3);
10. var BirthDay = new Date("2018/03/01"),
11. today = new Date,
12. timeold = today.getTime() - BirthDay.getTime(),
13. msPerDay = 864e5,
14. e_daysold = timeold / msPerDay,
15. daysold = Math.floor(e_daysold),
16. e_hrsold = 24 * (e_daysold - daysold),
17. hrsold = Math.floor(e_hrsold),
18. e_minsold = 60 * (e_hrsold - hrsold),
19. minsold = Math.floor(60 * (e_hrsold - hrsold)),
20. seconds = Math.floor(60 * (e_minsold - minsold));
21. span_dt_dt.innerHTML = daysold + "天" + hrsold + "小时" + minsold + "分" + seconds + "秒";
22. }
23. show_date_time();
24. </script>

样例 2

1. 当前系统时间
2. <span id="nowTime"></span>
3. <script type="text/javascript">
4. //获取系统时间
5. var newDate = '';
6. getLangDate();
7. //值小于10时，在前面补0
8. function dateFilter(date){
9. if(date < 10){return "0"+date;}
10. return date;
11. }
12. function getLangDate(){
13. var dateObj = new Date(); //表示当前系统时间的Date对象
14. var year = dateObj.getFullYear(); //当前系统时间的完整年份值
15. var month = dateObj.getMonth()+1; //当前系统时间的月份值
16. var date = dateObj.getDate(); //当前系统时间的月份中的日
17. var day = dateObj.getDay(); //当前系统时间中的星期值
18. var weeks = ["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];
19. var week = weeks[day]; //根据星期值，从数组中获取对应的星期字符串
20. var hour = dateObj.getHours(); //当前系统时间的小时值
21. var minute = dateObj.getMinutes(); //当前系统时间的分钟值
22. var second = dateObj.getSeconds(); //当前系统时间的秒钟值
23. var timeValue = "" +((hour >= 12) ? (hour >= 18) ? "晚上" : "下午" : "上午" ); //当前时间属于上午、晚上还是下午
24. newDate = dateFilter(year)+"年"+dateFilter(month)+"月"+dateFilter(date)+"日 "+" "+dateFilter(hour)+":"+dateFilter(minute)+":"+dateFilter(second);
25. document.getElementById("nowTime").innerHTML = timeValue+"好！当前时间为： "+newDate+"　"+week;
26. setTimeout("getLangDate()",1000);
27. }
28. </script>

样例三

1. function showtime(times) { //传入时间的参数
2. var time_1 = new Date(times).getTime();
3. var time_2 = new Date().getTime();
4. var time_3;
5. var time_distance;
6. //计算时间差
7. if (time_1 > time_2) {
8. time_distance = time_1 - time_2;
9. } else {
10. time_distance = time_2 - time_1;
11. }
12. if (time_distance > 0) {
13. // 天时分秒换算
14. var int_day = Math.floor(time_distance / 86400000);
15. time_distance -= int_day * 86400000;
16. var int_hour = Math.floor(time_distance / 3600000);
17. time_distance -= int_hour * 3600000;
18. var int_minute = Math.floor(time_distance / 60000);
19. time_distance -= int_minute * 60000;
20. var int_second = Math.floor(time_distance / 1000);
21. // 时分秒为单数时、前面加零
22. if (int_day < 10) {
23. int_day = "0" + int_day;
24. }
25. if (int_hour < 10) {
26. int_hour = "0" + int_hour;
27. }
28. if (int_minute < 10) {
29. int_minute = "0" + int_minute;
30. }

转载：https://blog.bnightning.cn/82.html