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This article shares with you how to get the current date and time in JavaScript and how to format it, the specific content is as follows
var myDate = new Date(); myDate.getYear(); //Get current year (2digit) myDate.getFullYear(); //Get the full year (4,1970-?63;63;63;) myDate.getMonth(); //Get current month (0-11,0 represents1month) myDate.getDate(); //Get current day (1-31) myDate.getDay(); //Get current day X (0-6,0 represents Sunday) myDate.getTime(); //Get current time (from1970.1.1Starting milliseconds) myDate.getHours(); //Get current hours (0-23) myDate.getMinutes(); //Get current minutes (0-59) myDate.getSeconds(); //Get current seconds (0-59) myDate.getMilliseconds(); //Get current milliseconds (0-999) myDate.toLocaleDateString(); //Get current date var mytime = myDate.toLocaleTimeString(); //Get current time myDate.toLocaleString(); //Get date and time
List of datetime script library methods
Date.prototype.isLeapYear Determine leap year
Date.prototype.Format Date formatting
Date.prototype.DateAdd Date calculation
Date.prototype.DateDiff Compare date difference
Date.prototype.toString Convert date to string
Date.prototype.toArray Split the date into an array
Date.prototype.DatePart Get part of the date information
Date.prototype.MaxDayOfDate Get the maximum number of days in the month for the date
Date.prototype.WeekNumOfYear Determine the week number of the year for the date
StringToDate Convert string to date type
IsValidDate Verify date validity
CheckDateTime Check complete date and time
daysBetween Date difference in days
js code:
//---------------------------------------------------
// Determine leap year
//---------------------------------------------------
Date.prototype.isLeapYear = function()
{
return (0 == this.getYear()%)4&&((this.getYear()%100!=0)||(this.getYear()%400==0)));
}
//---------------------------------------------------
// Date Formatting
// Format YYYY/yyyy/YY/yy Represents the year
// MM/M Month
// W/w Week
// dd/DD/d/D Date
// hh/HH/h/H Time
// mm/m Minutes
// ss/SS/s/S Seconds
//---------------------------------------------------
Date.prototype.Format = function(formatStr)
{
var str = formatStr;
var Week = ['Day','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
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' +
str=str.replace(/s|S/g,this.getSeconds());
return str;
}
//+---------------------------------------------------
//| Calculate the difference in days between two dates, 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,DateOne.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*3dtTmp.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 as date type or valid date format string
//+---------------------------------------------------
Date.prototype.DateDiff = function(strInterval, dtEnd) {
var dtStart = this;
if (typeof dtEnd == 'string' )//If it is a string, convert it to a date type
{
dtEnd = StringToDate(dtEnd);
}
switch (strInterval) {
case 's' :return parseInt((dtEnd - dtStart) / 1000);
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.getFullYear();
}
}
//+---------------------------------------------------
//| Output date string, overloaded the system's toString method
//+---------------------------------------------------
Date.prototype.toString = function(showWeek)
{
var myDate= this;
var str = myDate.toLocaleDateString();
if (showWeek)
{
var Week = ['Day','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
str += ' Week' + Week[myDate.getDay()];
}
return str;
}
//+---------------------------------------------------
//| Date validity check
//| Format is: YYYY-MM-DD or YYYY/MM/DD
//+---------------------------------------------------
{
var sDate=DateStr.replace(/(^\s+|\s+$)/g,''); //Trim spaces;
if(sDate=='') return true;
//If the format meets YYYY-(/)MM-(/)DD or YYYY-(/)M-(/)DD or YYYY-(/)M-(/)D or YYYY-(/)MM-(/)D will be replaced with ''
//In the database, a valid date can be: YYYY-MM/DD(2003-3/21), the database will automatically convert to YYYY-MM-
var s = sDate.replace(/[\d]{ 4,4 }[\-/}]{ 1 }[\d]{ 1,2 }[\-/}]{ 1 }[\d]{ 1,2 }/g,'');
if (s=='') //The format meets YYYY-MM-DD or YYYY-M-DD or YYYY-M-D or YYYY-MM-
{
var t=new Date(sDate.replace(/\-/g,'/
var ar = sDate.split(/[-/:]/);
if(ar[0] != t.getYear() || ar[1] != t.getMonth()+1 || ar[2] != t.getDate())
{
//alert('Incorrect date format! Format should be: YYYY-MM-DD or YYYY/MM/DD. Note leap years.');</br>
return false;
}
}
else
{
//alert('Incorrect date format! Format should be: YYYY-MM-DD or YYYY/MM/DD. Note leap years.');</br>
return false;
}
return true;
}
//+---------------------------------------------------
//| Date and time check
//| Format is: YYYY-MM-DD HH:MM:SS
//+---------------------------------------------------
function CheckDateTime(str)
{
var reg = /^(\d+)-(\d{ 1,2 })-(\d{ 1,2 }) (\d{ 1,2 }):(\d{ 1,2 }):(\d{ 1,2 })$/month = month
var r = str.match(reg);
if(r==null)return false;
r[2]=r[2]-1month = month
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;
}
//+---------------------------------------------------
//| Split 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 information
//| The parameter interval indicates the data type
//| y year m month d day w week ww week h hour n minute s second
//+---------------------------------------------------
Date.prototype.DatePart = function(interval)
{
var myDate = this;
var partStr='';
var Week = ['Day','Monday','Tuesday','Wednesday','Thursday','Friday','Saturday'];
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[myDate.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;
}
//+---------------------------------------------------
//| Obtain the maximum number of days in the current month of the 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;
}
//+---------------------------------------------------
//| Get the week number 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]+1month = month
var day = ary[2];
document.write('< script language=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 YYYY/MM/dd YYYY-MM-dd
//+---------------------------------------------------
function StringToDate(DateStr)
{
var converted = Date.parse(DateStr);
var myDate = new Date(converted);
if (isNaN(myDate))
{
//var delimCahar = DateStr.indexOf('/')!=-1?'/':'-';
var arys= DateStr.split('-');
myDate = new Date(arys[0],--arys[1],arys[2]);
}
return myDate;
}
If you want to implement such a clock:
2012Year12Month 03Day 17:21:16 Monday
//Local clock
function clockon() {
var now = new Date();
var year = now.getFullYear(); //getFullYear getYear
var month = now.getMonth();
var date = now.getDate();
var day = now.getDay();
var day = now.getDay();
var hour = now.getHours();
var minu = now.getMinutes();
var sec = now.getSeconds();
var week; + 1month = month
; 10) month = "0" + month;
if (date < 10) date = "0" + date;
if (hour < 10) hour = "0" + hour;
if (minu < 10) minu = "0" + minu;
if (sec < 10) sec = "0" + sec;
var arr_week = new Array("Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday");
week = arr_week[day];
var time = "";
time = year + "Year" + month + "Month" + date + "Day" + " " + hour + : + minu + : + sec + " " + week;
$("#bgclock").html(time);
var timer = setTimeout("clockon()", 200);
}
That's all for this article. Hope it will be helpful to your learning, and also hope everyone will support the Yelling Tutorial.
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