JavaScript中處理日期的一些函數和方法

1。解決2000問題

function y2k(number) { return (number < 1000) ? number + 1900 : number; }

2。檢查日期是否合法

// 當輸入參數為isDate(dd,mm,ccyy)時，表示要檢查年，月，日

// 當輸入參數為isDate(dd,mm) 表示預設年為目前年

// 當輸入參數為isDate(dd) 表示預設年，月為目前年月

// 注意輸入月份保證在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

}

以下是調用例子：

if (isDate(31,2,1997))

document.write("Valid");

else

document.write("Invalid");

3。如何判斷兩個日期中的間隔天數

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。如何将一個下拉清單框中的月份傳遞到另一頁

<FORM>

<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中加入下面的代碼

<SCRIPT LANGUAGE="JavaScript"><

document.formName.textName.value = location.search.substring(1);

//-SCRIPT>

或則：

<SCRIPT LANGUAGE="JavaScript">< www.86oo.com

document.write("<FORM><INPUT TYPE='TEXT' ");

document.write("VALUE='"location.search.substring(1)+"FORM>")

5。如何将一個字元串中的時間和目前時間做比較

/*其中的日期字元串可有以下格式：

格式 1 : 19970529

格式 2 : 970529

格式 3 : 29/05/1997

格式 4 : 29/05/97

輸入參數dateType是1到4的數字，表示使用哪種格式.

<!-

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,

dateString.substring(0,2));

else if (dateType == 4)

var date = new Date(dateString.substring(6,8),

return false;

if (date.toString() == today.toString())

return false; 您所浏覽的文章來自86oo.com

調用的例子如下：

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。如何根據一個人的生日計算他的歲數

function getAge(dateString,dateType) {

var yearNow = now.getYear();

var monthNow = now.getMonth();

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var dateNow = now.getDate();

var dob = new Date(dateString.substring(0,4),

var dob = new Date(dateString.substring(0,2),

var dob = new Date(dateString.substring(6,10),

var dob = new Date(dateString.substring(6,8),

dateString.substring(0,2)); 86oo精彩教程

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;

monthAge--;

var dateAge = 31 + dateNow - dateDob;

return yearAge + ' years ' + monthAge + ' months ' + dateAge + ' days';

調用例子

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>')

7。如何使用下面的格式dd/mm/yy在網頁中顯示日期

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);

8。如何使用下面的格式date month year在網頁中顯示日期

<SCRIPT LANGUAGE = 'JavaScript'> 86oo.com提供各類教程

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 day = date.getDate();

var month = date.getMonth() + 1;

document.write(day + " " + months[month] + " " + year);

9.如何讓我的網頁的最近更新日期更易讀

<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',

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';

else return 'th';

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()) + "."

10。如何顯示到某個特定日期的倒記時

function timeTillDate(whenDay,whenMonth,whenYear) {

var thisDay = now.getDate(), thisMonth = now.getMonth() + 1, thisYear = y2k(now.getYear())

var yearsDifference = whenYear - thisYear, monthsDifference = 0, daysDifference = 0, string = '';

if (whenMonth >= thisMonth) monthsDifference = whenMonth - thisMonth;

else { yearsDifference--; monthsDifference = whenMonth + 12 - thisMonth; }

if (whenDay >= thisDay)daysDifference = whenDay - thisDay;

if (monthsDifference > 0) monthsDifference--;

else { yearsDifference--; monthsDifference+=11; }

daysDifference = whenDay + 31 - thisDay;

if (yearsDifference < 0) return '';

if ((yearsDifference == 0) && (monthsDifference == 0) && (daysDifference == 0))

if (yearsDifference > 0) {

string = yearsDifference + ' year'; 86oo.com提供各類教程

if (yearsDifference > 1) string += 's';

string += ' ';

if (monthsDifference > 0) {

string += monthsDifference + ' month';

if (monthsDifference > 1) string += 's';

if (daysDifference > 0) {

string += daysDifference + ' day';

if (daysDifference > 1) string += 's';

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';

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if (minutesDifference > 0) {

string += minutesDifference + ' minute';

if (minutesDifference > 1) string +='s';

if (secondsDifference > 0) {

string += secondsDifference + ' second';

if (secondsDifference > 1) string +='s';

return string;

調用例子，例如現在到31/12/1999還有多久。

document.write(timeTillDate(31,12,1999));

11。如何從一個日期中減掉幾個小時

var date = new Date(Date.UTC(date.getYear(),date.getMonth(),date.getDate(),date.getHours(),date.getMinutes(),date.getSeconds()) - 5*60*60*1000);

document.write(date);

12。如何在一個日期中增加幾個月後并能夠正确顯示出來

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');

if (day == 1 || day == 21 || day == 31) return 'st';

else if (day == 2 || day == 22) return 'nd'; 86oo.com

else if (day == 3 || day == 23) return 'rd';

else return 'th';

function monthsahead(noofmonths) {

var date = new Date(today.getYear(),today.getMonth() + noofmonths,today.getDate(),today.getHours(),today.getMinutes(),today.getSeconds())

return date.getDate() + nths(date.getDate()) + ' ' + months[date.getMonth() + 1] + ' ' + y2k(date.getYear())

調用例子：

document.write(monthsahead(6));

JavaScript中處理日期的一些函數和方法

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