JavaScript中处理日期的一些函数和方法

深藏阁楼爱情的钟 2022-01-08 00:05 202阅读 0赞

1。 解决2000问题  
function y2k(number) \{ return (number < 1000) ? number + 1900 : number; \}  
2。 检查日期是否合法  
// 当输入参数为isDate(dd,mm,ccyy)时，表示要检查年，月，日  
// 当输入参数为isDate(dd,mm) 表示默认年为当前年  
// 当输入参数为isDate(dd) 表示默认年，月为当前年月  
// 注意输入月份保证在1-12以内。  
  
function isDate (day,month,year) \{  
var today = new Date();  
year = ((!year) ? y2k(today.getYear())year);  
month = ((!month) ? today.getMonth():month-1);  
if (!day) return false  
var test = new Date(year,month,day);

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if ( (y2k(test.getYear()) == year) &&  
(month == test.getMonth()) &&  
(day == test.getDate()) )  
return true;  
else  
return false  
\}  
  
以下是调用例子：  
if (isDate(31,2,1997))  
document.write("Valid");  
else  
document.write("Invalid");  
  
3。 如何判断两个日期中的间隔天数  
function daysElapsed(date1,date2) \{  
var difference = Date.UTC(date1.getYear(),date1.getMonth(),date1.getDate(),0,0,0)  
\- Date.UTC(date2.getYear(),date2.getMonth(),date2.getDate(),0,0,0);  
return difference/1000/60/60/24;

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\}  
  
4。 如何将一个下拉列表框中的月份传递到另一页  
<FORM>  
<SELECT NAME="selectName">  
<OPTION>January  
<OPTION>February  
<OPTION>March  
<OPTION>April  
<OPTION>May  
<OPTION>June  
<OPTION>July  
<OPTION>August  
<OPTION>Spetember  
<OPTION>October  
<OPTION>November  
<OPTION>December  
</SELECT>  
<INPUT TYPE="BUTTON" VALUE="Go" onClick="window.location.href = 'nextpage.html?' +  
this.form.selectName.options\[this.form.selectName.selectedIndex\].text">  
</FORM>  
  
在nextpage.html中加入下面的代码  
<FORM name="formName"><INPUT TYPE="TEXT" name="textName"><FORM>  
<SCRIPT LANGUAGE="JavaScript"><  
document.formName.textName.value = location.search.substring(1);  
//-SCRIPT>  
  
或则：  
<SCRIPT LANGUAGE="JavaScript">< www.86oo.com  
document.write("<FORM><INPUT TYPE='TEXT' ");  
document.write("VALUE='"location.search.substring(1)+"FORM>")  
//-SCRIPT>  
  
5。 如何将一个字符串中的时间和当前时间做比较  
<SCRIPT LANGUAGE="JavaScript">  
/\*其中的日期字符串可有以下格式：  
格式 1 : 19970529  
格式 2 : 970529  
格式 3 : 29/05/1997  
格式 4 : 29/05/97  
输入参数dateType是1到4的数字，表示使用哪种格式.  
\*/  
<!-  
function isitToday(dateString,dateType) \{  
var now = new Date();  
var today = new Date(now.getYear(),now.getMonth(),now.getDate())  
  
if (dateType == 1)  
var date = new Date(dateString.substring(0,4),  
dateString.substring(4,6)-1,

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dateString.substring(6,8));  
else if (dateType == 2)  
var date = new Date(dateString.substring(0,2),  
dateString.substring(2,4)-1,  
dateString.substring(4,6));  
else if (dateType == 3)  
var date = new Date(dateString.substring(6,10),  
dateString.substring(3,5)-1,

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dateString.substring(0,2));  
else if (dateType == 4)  
var date = new Date(dateString.substring(6,8),  
dateString.substring(3,5)-1,  
dateString.substring(0,2));  
else  
return false;  
  
if (date.toString() == today.toString())  
return true;  
else  
return false; 您所浏览的文章来自86oo.com  
\}  
调用的例子如下：  
if (isitToday("19970529",1)) alert('true'); else alert('false');  
if (isitToday("970529",2)) alert('true'); else alert('false');  
if (isitToday("29/05/1997",3)) alert('true'); else alert('false');  
if (isitToday("02/06/97",4)) alert('true'); else alert('false');  
//-  
</SCRIPT>  
  
6。 如何根据一个人的生日计算他的岁数  
<SCRIPT LANGUAGE="JavaScript"><  
/\*其中的日期字符串可有以下格式：  
格式 1 : 19970529  
格式 2 : 970529  
格式 3 : 29/05/1997  
格式 4 : 29/05/97  
输入参数dateType是1到4的数字，表示使用哪种格式.  
\*/  
function getAge(dateString,dateType) \{  
var now = new Date();  
var today = new Date(now.getYear(),now.getMonth(),now.getDate())  
var yearNow = now.getYear();  
var monthNow = now.getMonth();

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var dateNow = now.getDate();  
  
if (dateType == 1)  
var dob = new Date(dateString.substring(0,4),  
dateString.substring(4,6)-1,  
dateString.substring(6,8));  
else if (dateType == 2)  
var dob = new Date(dateString.substring(0,2),  
dateString.substring(2,4)-1,  
dateString.substring(4,6));

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else if (dateType == 3)  
var dob = new Date(dateString.substring(6,10),  
dateString.substring(3,5)-1,  
dateString.substring(0,2));  
else if (dateType == 4)  
var dob = new Date(dateString.substring(6,8),  
dateString.substring(3,5)-1,  
dateString.substring(0,2)); 86oo精彩教程  
else  
return '';  
  
var yearDob = dob.getYear();  
var monthDob = dob.getMonth();  
var dateDob = dob.getDate();  
  
yearAge = yearNow - yearDob;  
  
if (monthNow > monthDob)  
var monthAge = monthNow - monthDob;  
else \{  
yearAge--;  
var monthAge = 12 + monthNow -monthDob;  
\}  
if (dateNow > dateDob)  
var dateAge = dateNow - dateDob;  
else \{  
monthAge--;  
var dateAge = 31 + dateNow - dateDob;

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\}  
  
return yearAge + ' years ' + monthAge + ' months ' + dateAge + ' days';  
\}  
调用例子  
document.write(getAge("19650104",1)+'BR>')  
document.write(getAge("650104",2)+'BR>')  
document.write(getAge("04/01/1965",3)+'BR>')  
document.write(getAge("04/01/65",4)+'BR>')  
//-SCRIPT>  
  
7。 如何使用下面的格式dd/mm/yy在网页中显示日期  
<SCRIPT LANGUAGE = 'JavaScript'>  
<!-  
var date = new Date();  
var d = date.getDate();  
var day = (d < 10) ? '0' + d : d;  
var m = date.getMonth() + 1;  
var month = (m < 10) ? '0' + m : m;  
var yy = date.getYear();  
var year = (yy < 1000) ? yy + 1900 : yy;  
  
document.write(day + "/" + month + "/" + year);  
//-  
</SCRIPT>  
  
8。 如何使用下面的格式date month year在网页中显示日期  
<SCRIPT LANGUAGE = 'JavaScript'> 86oo.com提供各类教程  
<!-  
function makeArray() \{  
for (i = 0; i<makeArray.arguments.length; i++)  
this\[i + 1\] = makeArray.arguments\[i\];  
\}  
  
var months = new makeArray('January','February','March',  
'April','May','June','July','August','September',  
'October','November','December');  
  
var date = new Date();  
var day = date.getDate();  
var month = date.getMonth() + 1;  
var yy = date.getYear();  
var year = (yy < 1000) ? yy + 1900 : yy;  
  
document.write(day + " " + months\[month\] + " " + year);  
//-  
</SCRIPT>  
  
9. 如何让我的网页的最近更新日期更易读  
<SCRIPT LANGUAGE = 'JavaScript'><  
function makeArray0() \{  
for (i = 0; i<makeArray0.arguments.length; i++)  
this\[i\] = makeArray0.arguments\[i\];

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\}  
var days = new makeArray0("Sunday","Monday","Tuesday","Wednesday",  
"Thursday","Friday","Saturday");  
var months = new makeArray0('January','February','March',  
'April','May','June','July','August','September',  
'October','November','December');  
function nths(day) \{  
if (day == 1 || day == 21 || day == 31)  
return 'st';  
else  
if (day == 2 || day == 22)  
return 'nd';  
if (day == 3 || day == 23)  
return 'rd';

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else return 'th';  
\}  
function y2k(number) \{ return (number < 1000) ? number + 1900 : number; \}  
var last = document.lastModified;  
var date = new Date(last);  
document.write("Last updated on " + days\[date.getDay()\] + ' ' +  
date.getDate() + nths(date.getDate()) + " " +  
months\[date.getMonth()\] + ", " +  
(y2k(date.getYear()) + "."  
//-SCRIPT>  
  
10。 如何显示到某个特定日期的倒记时  
<SCRIPT LANGUAGE="JavaScript"><  
function y2k(number) \{ return (number < 1000) ? number + 1900 : number; \}  
  
function timeTillDate(whenDay,whenMonth,whenYear) \{  
var now = new Date();  
var thisDay = now.getDate(), thisMonth = now.getMonth() + 1, thisYear = y2k(now.getYear())  
var yearsDifference = whenYear - thisYear, monthsDifference = 0, daysDifference = 0, string = '';

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if (whenMonth >= thisMonth) monthsDifference = whenMonth - thisMonth;  
else \{ yearsDifference--; monthsDifference = whenMonth + 12 - thisMonth; \}  
  
if (whenDay >= thisDay)daysDifference = whenDay - thisDay;  
else \{  
if (monthsDifference > 0) monthsDifference--;  
else \{ yearsDifference--; monthsDifference+=11; \}  
daysDifference = whenDay + 31 - thisDay;  
\}  
  
if (yearsDifference < 0) return '';  
  
if ((yearsDifference == 0) && (monthsDifference == 0) && (daysDifference == 0))  
return '';  
  
if (yearsDifference > 0) \{  
string = yearsDifference + ' year'; 86oo.com提供各类教程  
if (yearsDifference > 1) string += 's';  
string += ' ';  
\}  
  
if (monthsDifference > 0) \{  
string += monthsDifference + ' month';  
if (monthsDifference > 1) string += 's';  
string += ' ';  
\}  
if (daysDifference > 0) \{  
string += daysDifference + ' day';  
if (daysDifference > 1) string += 's';  
string += ' ';  
\}  
  
var difference = Date.UTC(now.getYear(),now.getMonth(),now.getDate(),now.getHours(),now.getMinutes(),now.getSeconds()) -

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Date.UTC(now.getYear(),now.getMonth(),now.getDate(),0,0,0);  
  
difference = 1000\*60\*60\*24 - difference;  
  
var hoursDifference = Math.floor(difference/1000/60/60);  
difference = difference - hoursDifference\*1000\*60\*60  
var minutesDifference = Math.floor(difference/1000/60);  
difference = difference - minutesDifference\*1000\*60  
var secondsDifference = Math.floor(difference/1000);  
  
if (hoursDifference > 0) \{  
string += hoursDifference + ' hour';  
if (hoursDifference > 1) string +='s';  
string += ' ';  
\}

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if (minutesDifference > 0) \{  
string += minutesDifference + ' minute';  
if (minutesDifference > 1) string +='s';  
string += ' ';  
\}  
  
if (secondsDifference > 0) \{  
string += secondsDifference + ' second';  
if (secondsDifference > 1) string +='s';  
string += ' ';  
\}  
return string;  
\}  
  
调用例子，例如现在到31/12/1999还有多久。  
document.write(timeTillDate(31,12,1999));  
//-SCRIPT>  
  
11。 如何从一个日期中减掉几个小时  
<SCRIPT LANGUAGE = 'JavaScript'><  
var date = new Date();  
var date = new Date(Date.UTC(date.getYear(),date.getMonth(),date.getDate(),date.getHours(),date.getMinutes(),date.getSeconds()) - 5\*60\*60\*1000);

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转载于:https://www.cnblogs.com/pyt5208/archive/2007/11/03/947771.html