Javascript to get the current date and time and other date Operation Summaries _ javascript skills

This article mainly introduces how to get the summary of current date and time and other date operations by js. Interested partners can refer to the examples in this article to share common scenarios of javascript time operations, for your reference, the specific content is as follows:

Var myDate = new Date (); myDate. getYear (); // obtain the current year (2 digits) myDate. getFullYear (); // obtain the complete year (4 digits, 1970 -????) MyDate. getMonth (); // obtain the current month (0-11, 0 represents January) myDate. getDate (); // obtain the current day (1-31) myDate. getDay (); // obtain the current day X (0-6, 0 represents Sunday) myDate. getTime (); // obtain the current time (milliseconds starting from 1970.1.1) myDate. getHours (); // obtain the current hour (0-23) myDate. getMinutes (); // get the current number of minutes (0-59) myDate. getSeconds (); // obtain the current number of seconds (0-59) myDate. getMilliseconds (); // get the current number of milliseconds (0-999) myDate. toLocaleDateString (); // obtain the current date var mytime = myDate. toLocaleTimeString (); // obtain the current time myDate. toLocaleString (); // obtain the date and time

Date and Time script library method list

Date. prototype. isLeapYear determines the Date of the leap year. prototype. format Date. prototype. dateAdd Date calculation Date. prototype. dateDiff compares the Date difference. prototype. toString Date to string Date. prototype. toArray Date is split into array Date. prototype. datePart obtains part of the Date information. prototype. maxDayOfDate is the maximum number of days in the month where the Date is located. prototype. weekNumOfYear judge the week of the year where the date is located StringToDate string to date type IsValidDate verify date validity CheckDateTime full date time check daysBetween date day difference

Javascript code block

// ----------------- // Determine a leap year // ----------------- Date. prototype. isLeapYear = function () {return (0 = this. getYear () % 4 & (this. get year () % 100! = 0) | (this. getYear () % 400 = 0 )));} // ----------------- // format YYYY/yyyy/YY/yy indicates the year // MM/M month // W/w weeks // dd/DD/d/D date // hh/HH/h/H time // mm/m min // ss/SS/s/S s // ----------------- Date. prototype. format = function (formatStr) {var str = formatStr; var Week = ['day', 'yi', '2', '3', '4', '5 ', '6']; str = str. replace (/yyyy | YYYY/, this. getFullYear (); str = str. replace (/yy | YY/, (this. getYear () % 100)> 9? (This. getYear () % 100 ). toString (): '0' + (this. getYear () % 100); str = str. replace (/MM/, this. getMonth ()> 9? This. getMonth (). toString (): '0' + this. getMonth (); str = str. replace (/M/g, this. getMonth (); str = str. replace (/w | W/g, Week [this. getDay ()]); str = str. replace (/dd | DD/, this. getDate ()> 9? This. getDate (). toString (): '0' + this. getDate (); str = str. replace (/d | D/g, this. getDate (); str = str. replace (/hh | HH/, this. getHours ()> 9? This. getHours (). toString (): '0' + this. getHours (); str = str. replace (/h | H/g, this. getHours (); str = str. replace (/mm/, this. getMinutes ()> 9? This. getMinutes (). toString (): '0' + this. getMinutes (); str = str. replace (/m/g, this. getMinutes (); str = str. replace (/ss | SS/, this. getSeconds ()> 9? This. getSeconds (). toString (): '0' + this. getSeconds (); str = str. replace (/s | S/g, this. getSeconds (); return str;} // + ----------------- // | returns the number of days in two different time ranges. The date format is YYYY-MM-dd // + --------------- function daysBetween (DateOne, dateTwo) {var OneMonth = DateOne. substring (5, DateOne. lastIndexOf ('-'); var OneDay = DateOne. substring (DateOne. length, DateOne. lastIndexOf ('-') + 1); var OneYear = DateOne. substring (0, Date One. indexOf ('-'); var TwoMonth = DateTwo. substring (5, DateTwo. lastIndexOf ('-'); var TwoDay = DateTwo. substring (DateTwo. length, DateTwo. lastIndexOf ('-') + 1); var TwoYear = DateTwo. substring (0, DateTwo. indexOf ('-'); var cha = (Date. parse (OneMonth + '/' + OneDay + '/' + OneYear)-Date. parse (TwoMonth + '/' + TwoDay + '/' + TwoYear)/86400000); return Math. abs (cha);} // + ----------------- // | date calculation // + ----------------- Date. prototype. dateAdd = function (strInterval, Number) {var dtTmp = this; switch (strInterval) {case's ': return new Date (Date. parse (dtTmp) + (1000 * Number); case 'N': return new Date (Date. parse (dtTmp) + (60000 * Number); case 'H': return new Date (Date. parse (dtTmp) + (3600000 * Number); case 'D': return new Date (Date. parse (dtTmp) + (86400000 * Number); case 'W': return new Date (Date. parse (DtTmp) + (86400000*7) * Number); case 'q': return new Date (dtTmp. getFullYear (), (dtTmp. getMonth () + Number * 3, dtTmp. getDate (), dtTmp. getHours (), dtTmp. getMinutes (), dtTmp. getSeconds (); case 'M': return new Date (dtTmp. getFullYear (), (dtTmp. getMonth () + Number, dtTmp. getDate (), dtTmp. getHours (), dtTmp. getMinutes (), dtTmp. getSeconds (); case 'y': return new Date (dtTmp. getFullYear () + Number ), DtTmp. getMonth (), dtTmp. getDate (), dtTmp. getHours (), dtTmp. getMinutes (), dtTmp. getSeconds () ;}/// + ----------------- // | compare Date difference dtEnd format to Date type or valid Date format string // + ----------------- Date. prototype. dateDiff = function (strInterval, dtEnd) {var dtStart = this; if (typeof dtEnd = 'string ') // If the string is converted to the date type {dtEnd = StringToDate (dtEnd);} switch (strInterval) {case's ': return parseInt (dtEnd-dtStart)/10 00); case 'N': return parseInt (dtEnd-dtStart)/60000); case 'H': return parseInt (dtEnd-dtStart)/3600000 ); case 'D': return parseInt (dtEnd-dtStart)/86400000); case 'W': return parseInt (dtEnd-dtStart)/(86400000*7 )); case 'M': return (dtEnd. getMonth () + 1) + (dtEnd. getFullYear ()-dtStart. getFullYear () * 12)-(dtStart. getMonth () + 1); case 'y': return dtEnd. getFullYear ()-dtStart. getFu LlYear () ;}/// + ----------------- // | Date output string. The system's toString method is reloaded. // + ----------------- Date. prototype. toString = function (showWeek) {var myDate = this; var str = myDate. toLocaleDateString (); if (showWeek) {var Week = ['day', 'yi', '2', '3', '4', '5 ', '6']; str + = 'Week' + Week [myDate. getDay ()];} return str;} // + ----------------- // | date validity verification // | format: YYYY-MM-DD or YYYY/MM/DD // + --------------- function IsValidD Ate (DateStr) {var sDate = DateStr. replace (/(^ \ s + | \ s + $)/g, "); // remove spaces on both sides; if (sDate =") return true; // if the format is YYYY-(/) MM-(/) DD Or YYYY-(/) M -(/) D or YYYY-(/) MM-(/) D is replaced with "// database, valid date can be: YYYY-MM/DD ), the database automatically converts to the YYYY-MM-DD format var s = sDate. replace (/[\ d] {4, 4} [-/] {1} [\ d] {1} [-/] {1} [\ d] {1}/g, "); if (s =") // The description format meets the YYYY-MM-DD or YYYY-M-DD or YYYY-M-D or YYYY-MM-D {var t = new Date (sDate. replace (/-/G, '/'); var ar = sDate. split (/[-/:]/); if (ar [0]! = T. getYear () | ar [1]! = T. getMonth () + 1 | ar [2]! = T. getDate () {// alert ('incorrect date format! Format: YYYY-MM-DD or YYYY/MM/DD. Pay attention to the leap year. '); Return false ;}} else {// alert (' incorrect date format! Format: YYYY-MM-DD or YYYY/MM/DD. Pay attention to the leap year. '); Return false;} return true;} // + ----------------- // | Date and Time check // | format: YYYY-MM-DD HH: MM: SS // + ----------------- function CheckDateTime (str) {var reg =/^ (\ d +)-(\ d {1, 2})-(\ d {1, 2 }) (\ d {1, 2}) :( \ d {1, 2}) :( \ d {1, 2}) $/; var r = str. match (reg); if (r = null) return false; r [2] = r [2]-1; var d = new Date (r [1], r [2], r [3], r [4], r [5], r [6]); if (d. getFullYear ()! = R [1]) return false; if (d. getMonth ()! = R [2]) return false; if (d. getDate ()! = R [3]) return false; if (d. getHours ()! = R [4]) return false; if (d. getMinutes ()! = R [5]) return false; if (d. getSeconds ()! = R [6]) return false; return true;} // + ----------------- // | divide the Date into an array // + ------------------- Date. prototype. toArray = function () {var myDate = this; var myArray = Array (); myArray [0] = myDate. getFullYear (); myArray [1] = myDate. getMonth (); myArray [2] = myDate. getDate (); myArray [3] = myDate. getHours (); myArray [4] = myDate. getMinutes (); myArray [5] = myDate. getSeconds (); return myArray;} // + -------------- --- // | Obtain Date data // | the interval parameter indicates the Data Type // | y, m, month, D, w, week, ww, week, h, n minutes, s/+ --------------- Date. prototype. datePart = function (interval) {var myDate = this; var partStr = "; var Week = ['day', 'day', 'two', '3 ', '4', '5', '6']; switch (interval) {case 'y': partStr = myDate. getFullYear (); break; case 'M': partStr = myDate. getMonth () + 1; break; case 'D': partStr = myDate. getDate (); break; case 'W': partStr = Week [m YDate. getDay ()]; break; case 'ww ': partStr = myDate. weekNumOfYear (); break; case 'H': partStr = myDate. getHours (); break; case 'N': partStr = myDate. getMinutes (); break; case's ': partStr = myDate. getSeconds (); break;} return partStr;} // + ----------------- // | obtains the maximum number of days of the month of the current Date. // + ----------------- Date. prototype. maxDayOfDate = function () {var myDate = this; var ary = myDate. toArray (); var date1 = (new Date (ary [0], ary [1] + 1, 1); var date2 = date1.dateAdd (1, 'M', 1 ); var result = dateDiff (date1.Format ('yyyy-MM-dd'), date2.Format ('yyyy-MM-dd'); return result ;} // + ----------------- // | obtain the week of the current Date in the year. // + --------------- Date. prototype. weekNumOfYear = function () {var myDate = this; var ary = myDate. toArray (); var year = ary [0]; var month = ary [1] + 1; var day = ary [2]; document. write ('<script langu Age = VBScript> \ n'); document. write ('mydate = Datue ("+ month + '-' + day + '-' + year +") \ n'); document. write ('result = DatePart ('ww ', myDate) \ n'); document. write ('\ n'); return result ;} // + ----------------- // | convert string to date type // | format: MM/dd/yyyy mm-dd-YYYY/MM/dd YYYY-MM-dd // + ------------function ----- stringToDate (DateStr) {var converted = Date. parse (DateStr); var myDate = new Date (converted); if (isNaN (my Date) {// var delimCahar = DateStr. indexOf ('/')! =-1? '/': '-'; Var arys = DateStr. split ('-'); myDate = new Date (arys [0], -- arys [1], arys [2]);} return myDate ;}

To display: the current date plus time (for example)

Function CurentTime () {var now = new Date (); var year = now. getFullYear (); // year var month = now. getMonth () + 1; // month var day = now. getDate (); // var hh = now. getHours (); // var mm = now. getMinutes (); // minute var clock = year + "-"; if (month <10) clock + = "0"; clock + = month + "-"; if (day <10) clock + = "0"; clock + = day + ""; if (hh <10) clock + = "0 "; clock + = hh + ":"; if (mm <10) clock + = '0'; clock + = mm; return (clock );}

If you still want to continue, you can refer to the topic for further study.Summary of javascript time operations,Summary of javascript date operations

I hope this article will help you learn about javascript programming.