How JavaScript calculates the time difference between two days

Sometimes we need to know how many days between two dates, how many hours, or even how many minutes in seconds. Here we use JavaScript to implement a function to calculate the time difference of two dates, first look at the code:

01	<script type="text/javascript">

02

03

/**

04	* 时间对象的格式化;

05

*/

06	Date.prototype.format = function(format){

07

/*

08	* eg:format="YYYY-MM-dd hh:mm:ss";

09

*/

10

varo = {

11	"M+":  this.getMonth()+1,  //month

12	"d+":  this.getDate(),     //day

13	"h+":  this.getHours(),    //hour

14	"m+":  this.getMinutes(),  //minute

15	"s+":  this.getSeconds(), //second

16	"q+":  Math.floor((this.getMonth()+3)/3),  //quarter

17	"S":  this.getMilliseconds() //millisecond

18

}

19

20	if(/(y+)/.test(format)) {

21	format = format.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));

22

}

23

24	for(vark ino) {

25	if(newRegExp("("+ k +")").test(format)) {

26	format = format.replace(RegExp.$1, RegExp.$1.length==1 ? o[k] : ("00"+ o[k]).substr((""+ o[k]).length));

27

}

28

}

29	returnformat;

30

}

31

32

33

/*

34	* 获得时间差,时间格式为 年-月-日 小时:分钟:秒 或者 年/月/日 小时：分钟：秒

35	* 其中，年月日为全格式，例如 ： 2010-10-12 01:00:00

36	* 返回精度为：秒，分，小时，天

37

*/

38

39	functionGetDateDiff(startTime, endTime, diffType) {

40	//将xxxx-xx-xx的时间格式，转换为 xxxx/xx/xx的格式

41	startTime = startTime.replace(/\-/g, "/");

42	endTime = endTime.replace(/\-/g, "/");

43

44	//将计算间隔类性字符转换为小写

45	diffType = diffType.toLowerCase();

46	varsTime = newDate(startTime);      //开始时间

47	vareTime = newDate(endTime);  //结束时间

48

//作为除数的数字

49	vardivNum = 1;

50	switch(diffType) {

51	case"second":

52	divNum = 1000;

53

break;

54	case"minute":

55	divNum = 1000 * 60;

56

break;

57	case"hour":

58	divNum = 1000 * 3600;

59

break;

60	case"day":

61	divNum = 1000 * 3600 * 24;

62

break;

63

default:

64

break;

65

}

66	returnparseInt((eTime.getTime() - sTime.getTime()) / parseInt(divNum));

67

}

68

69	vartestDate = newDate();

70	vartestStr = testDate.format("yyyy-MM-dd hh:mm:ss");

71

72	varresult = GetDateDiff("2010-02-26 16:00:00", testStr, "day");

73	document.write("简明现代魔法 www.nowamagic.net 建站已有"+ result + "天了。");

74	//alert(result);

75

</script>

The method used is simple, such as calculating the number of days to do this:

1	GetDateDiff("2010-02-26 16:00:00", "2011-07-02 21:48:40", "day");

The number of seconds can be calculated as follows:

1	GetDateDiff("2010-02-26 16:00:00", "2011-07-02 21:48:40", "second");

The operating result of the instance program is as follows: Guangde County Energy Bureau

The Concise modern Magic Www.nowamagic.net station has been built for 1695 days.

How JavaScript calculates the time difference between two days