new - Conversión de fechas en JavaScript

new date javascript format dd mm yyyy

Question

¿Cómo puedo convertir un formato de fecha a otro formato en JavaScript?

Ejemplo:

el viejo formato es

YYYY / MM / DD

pero quiero convertirlo en

DD-MM-YYYY

Answer 1

Aquí -

// Utility function to append a 0 to single-digit numbers
Date.LZ = function(x) {return(x<0||x>9?"":"0")+x};
// Full month names. Change this for local month names
Date.monthNames = new Array(''January'',''February'',''March'',''April'',''May'',''June'',''July'',''August'',''September'',''October'',''November'',''December'');
// Month abbreviations. Change this for local month names
Date.monthAbbreviations = new Array(''Jan'',''Feb'',''Mar'',''Apr'',''May'',''Jun'',''Jul'',''Aug'',''Sep'',''Oct'',''Nov'',''Dec'');
// Full day names. Change this for local month names
Date.dayNames = new Array(''Sunday'',''Monday'',''Tuesday'',''Wednesday'',''Thursday'',''Friday'',''Saturday'');
// Day abbreviations. Change this for local month names
Date.dayAbbreviations = new Array(''Sun'',''Mon'',''Tue'',''Wed'',''Thu'',''Fri'',''Sat'');
// Used for parsing ambiguous dates like 1/2/2000 - default to preferring ''American'' format meaning Jan 2.
// Set to false to prefer ''European'' format meaning Feb 1
Date.preferAmericanFormat = true;
// If the getFullYear() method is not defined, create it
if (!Date.prototype.getFullYear) {
Date.prototype.getFullYear = function() { var yy=this.getYear(); return (yy<1900?yy+1900:yy); } ;
}
// Parse a string and convert it to a Date object.
// If no format is passed, try a list of common formats.
// If string cannot be parsed, return null.
// Avoids regular expressions to be more portable.
Date.parseString = function(val, format) {
// If no format is specified, try a few common formats
if (typeof(format)=="undefined" || format==null || format=="") {
var generalFormats=new Array(''y-M-d'',''MMM d, y'',''MMM d,y'',''y-MMM-d'',''d-MMM-y'',''MMM d'',''MMM-d'',''d-MMM'');
var monthFirst=new Array(''M/d/y'',''M-d-y'',''M.d.y'',''M/d'',''M-d'');
var dateFirst =new Array(''d/M/y'',''d-M-y'',''d.M.y'',''d/M'',''d-M'');
var checkList=new Array(generalFormats,Date.preferAmericanFormat?monthFirst:dateFirst,Date.preferAmericanFormat?dateFirst:monthFirst);
for (var i=0; i<checkList.length; i++) {
var l=checkList[i];
for (var j=0; j<l.length; j++) {
var d=Date.parseString(val,l[j]);
if (d!=null) {
return d;
}
}
}
return null;
};
this.isInteger = function(val) {
for (var i=0; i < val.length; i++) {
if ("1234567890".indexOf(val.charAt(i))==-1) {
return false;
}
}
return true;
};
this.getInt = function(str,i,minlength,maxlength) {
for (var x=maxlength; x>=minlength; x--) {
var token=str.substring(i,i+x);
if (token.length < minlength) {
return null;
}
if (this.isInteger(token)) {
return token;
}
}
return null;
};
val=val+"";
format=format+"";
var i_val=0;
var i_format=0;
var c="";
var token="";
var token2="";
var x,y;
var year=new Date().getFullYear();
var month=1;
var date=1;
var hh=0;
var mm=0;
var ss=0;
var ampm="";
while (i_format < format.length) {
// Get next token from format string
c=format.charAt(i_format);
token="";
while ((format.charAt(i_format)==c) && (i_format < format.length)) {
token += format.charAt(i_format++);
}
// Extract contents of value based on format token
if (token=="yyyy" || token=="yy" || token=="y") {
if (token=="yyyy") {
x=4;y=4;
}
if (token=="yy") {
x=2;y=2;
}
if (token=="y") {
x=2;y=4;
}
year=this.getInt(val,i_val,x,y);
if (year==null) {
return null;
}
i_val += year.length;
if (year.length==2) {
if (year > 70) {
year=1900+(year-0);
}
else {
year=2000+(year-0);
}
}
}
else if (token=="MMM" || token=="NNN"){
month=0;
var names = (token=="MMM"?(Date.monthNames.concat(Date.monthAbbreviations)):Date.monthAbbreviations);
for (var i=0; i<names.length; i++) {
var month_name=names[i];
if (val.substring(i_val,i_val+month_name.length).toLowerCase()==month_name.toLowerCase()) {
month=(i%12)+1;
i_val += month_name.length;
break;
}
}
if ((month < 1)||(month>12)){
return null;
}
}
else if (token=="EE"||token=="E"){
var names = (token=="EE"?Date.dayNames:Date.dayAbbreviations);
for (var i=0; i<names.length; i++) {
var day_name=names[i];
if (val.substring(i_val,i_val+day_name.length).toLowerCase()==day_name.toLowerCase()) {
i_val += day_name.length;
break;
}
}
}
else if (token=="MM"||token=="M") {
month=this.getInt(val,i_val,token.length,2);
if(month==null||(month<1)||(month>12)){
return null;
}
i_val+=month.length;
}
else if (token=="dd"||token=="d") {
date=this.getInt(val,i_val,token.length,2);
if(date==null||(date<1)||(date>31)){
return null;
}
i_val+=date.length;
}
else if (token=="hh"||token=="h") {
hh=this.getInt(val,i_val,token.length,2);
if(hh==null||(hh<1)||(hh>12)){
return null;
}
i_val+=hh.length;
}
else if (token=="HH"||token=="H") {
hh=this.getInt(val,i_val,token.length,2);
if(hh==null||(hh<0)||(hh>23)){
return null;
}
i_val+=hh.length;
}
else if (token=="KK"||token=="K") {
hh=this.getInt(val,i_val,token.length,2);
if(hh==null||(hh<0)||(hh>11)){
return null;
}
i_val+=hh.length;
hh++;
}
else if (token=="kk"||token=="k") {
hh=this.getInt(val,i_val,token.length,2);
if(hh==null||(hh<1)||(hh>24)){
return null;
}
i_val+=hh.length;
hh--;
}
else if (token=="mm"||token=="m") {
mm=this.getInt(val,i_val,token.length,2);
if(mm==null||(mm<0)||(mm>59)){
return null;
}
i_val+=mm.length;
}
else if (token=="ss"||token=="s") {
ss=this.getInt(val,i_val,token.length,2);
if(ss==null||(ss<0)||(ss>59)){
return null;
}
i_val+=ss.length;
}
else if (token=="a") {
if (val.substring(i_val,i_val+2).toLowerCase()=="am") {
ampm="AM";
}
else if (val.substring(i_val,i_val+2).toLowerCase()=="pm") {
ampm="PM";
}
else {
return null;
}
i_val+=2;
}
else {
if (val.substring(i_val,i_val+token.length)!=token) {
return null;
}
else {
i_val+=token.length;
}
}
}
// If there are any trailing characters left in the value, it doesn''t match
if (i_val != val.length) {
return null;
}
// Is date valid for month?
if (month==2) {
// Check for leap year
if ( ( (year%4==0)&&(year%100 != 0) ) || (year%400==0) ) { // leap year
if (date > 29){
return null;
}
}
else {
if (date > 28) {
return null;
}
}
}
if ((month==4)||(month==6)||(month==9)||(month==11)) {
if (date > 30) {
return null;
}
}
// Correct hours value
if (hh<12 && ampm=="PM") {
hh=hh-0+12;
}
else if (hh>11 && ampm=="AM") {
hh-=12;
}
return new Date(year,month-1,date,hh,mm,ss);
};
// Check if a date string is valid
Date.isValid = function(val,format) {
return (Date.parseString(val,format) != null);
};
// Check if a date object is before another date object
Date.prototype.isBefore = function(date2) {
if (date2==null) {
return false;
}
return (this.getTime()<date2.getTime());
};
// Check if a date object is after another date object
Date.prototype.isAfter = function(date2) {
if (date2==null) {
return false;
}
return (this.getTime()>date2.getTime());
};
// Check if two date objects have equal dates and times
Date.prototype.equals = function(date2) {
if (date2==null) {
return false;
}
return (this.getTime()==date2.getTime());
};
// Check if two date objects have equal dates, disregarding times
Date.prototype.equalsIgnoreTime = function(date2) {
if (date2==null) {
return false;
}
var d1 = new Date(this.getTime()).clearTime();
var d2 = new Date(date2.getTime()).clearTime();
return (d1.getTime()==d2.getTime());
};
// Format a date into a string using a given format string
Date.prototype.format = function(format) {
format=format+"";
var result="";
var i_format=0;
var c="";
var token="";
var y=this.getYear()+"";
var M=this.getMonth()+1;
var d=this.getDate();
var E=this.getDay();
var H=this.getHours();
var m=this.getMinutes();
var s=this.getSeconds();
var yyyy,yy,MMM,MM,dd,hh,h,mm,ss,ampm,HH,H,KK,K,kk,k;
// Convert real date parts into formatted versions
var value=new Object();
if (y.length < 4) {
y=""+(+y+1900);
}
value["y"]=""+y;
value["yyyy"]=y;
value["yy"]=y.substring(2,4);
value["M"]=M;
value["MM"]=Date.LZ(M);
value["MMM"]=Date.monthNames[M-1];
value["NNN"]=Date.monthAbbreviations[M-1];
value["d"]=d;
value["dd"]=Date.LZ(d);
value["E"]=Date.dayAbbreviations[E];
value["EE"]=Date.dayNames[E];
value["H"]=H;
value["HH"]=Date.LZ(H);
if (H==0){
value["h"]=12;
}
else if (H>12){
value["h"]=H-12;
}
else {
value["h"]=H;
}
value["hh"]=Date.LZ(value["h"]);
value["K"]=value["h"]-1;
value["k"]=value["H"]+1;
value["KK"]=Date.LZ(value["K"]);
value["kk"]=Date.LZ(value["k"]);
if (H > 11) {
value["a"]="PM";
}
else {
value["a"]="AM";
}
value["m"]=m;
value["mm"]=Date.LZ(m);
value["s"]=s;
value["ss"]=Date.LZ(s);
while (i_format < format.length) {
c=format.charAt(i_format);
token="";
while ((format.charAt(i_format)==c) && (i_format < format.length)) {
token += format.charAt(i_format++);
}
if (typeof(value[token])!="undefined") {
result=result + value[token];
}
else {
result=result + token;
}
}
return result;
};
// Get the full name of the day for a date
Date.prototype.getDayName = function() {
return Date.dayNames[this.getDay()];
};
// Get the abbreviation of the day for a date
Date.prototype.getDayAbbreviation = function() {
return Date.dayAbbreviations[this.getDay()];
};
// Get the full name of the month for a date
Date.prototype.getMonthName = function() {
return Date.monthNames[this.getMonth()];
};
// Get the abbreviation of the month for a date
Date.prototype.getMonthAbbreviation = function() {
return Date.monthAbbreviations[this.getMonth()];
};
// Clear all time information in a date object
Date.prototype.clearTime = function() {
this.setHours(0);
this.setMinutes(0);
this.setSeconds(0);
this.setMilliseconds(0);
return this;
};
// Add an amount of time to a date. Negative numbers can be passed to subtract time.
Date.prototype.add = function(interval, number) {
if (typeof(interval)=="undefined" || interval==null || typeof(number)=="undefined" || number==null) {
return this;
}
number = +number;
if (interval==''y'') { // year
this.setFullYear(this.getFullYear()+number);
}
else if (interval==''M'') { // Month
this.setMonth(this.getMonth()+number);
}
else if (interval==''d'') { // Day
this.setDate(this.getDate()+number);
}
else if (interval==''w'') { // Weekday
var step = (number>0)?1:-1;
while (number!=0) {
this.add(''d'',step);
while(this.getDay()==0 || this.getDay()==6) {
this.add(''d'',step);
}
number -= step;
}
}
else if (interval==''h'') { // Hour
this.setHours(this.getHours() + number);
}
else if (interval==''m'') { // Minute
this.setMinutes(this.getMinutes() + number);
}
else if (interval==''s'') { // Second
this.setSeconds(this.getSeconds() + number);
}
return this;
};

Copie esto en un archivo .js e inclúyalo en su página.

Luego puede usar el método format () en el objeto Date.

También puedes encontrar otra biblioteca aquí .

Answer 2

Creo que puede usar datepicker de jQuery UI library: use el método parseDate para convertir una cadena a un objeto Date, y luego formatDate para convertir el objeto Date en otra cadena. Verifique las muestras proporcionadas en el sitio; incluyen modificadores de formato.

Answer 3

Mis extensiones de fecha lo harán bien; también analizan los formatos de datos y también hacen una gran cantidad de citas de matemática / comparación:

Biblioteca DP_DateExtensions

No estoy seguro si esto ayudará, pero lo encontré invaluable en varios proyectos. Las funciones de fecha están (principalmente) basadas en CFML (si eso importa).

No estoy diciendo que sean mejores que las otras opciones dadas, pero estoy orgulloso de ellos y nunca (bueno ... casi nunca) duele tener que elegir.

Answer 4

Si no usas jQuery (y no puedo pensar por qué, pero por las dudas), he creado un parche para el objeto Fecha de Javascript que te permitirá analizar fechas de cadenas en diferentes formatos y convertir fechas a cadenas. en diferentes formatos.

Puedes ver más información sobre el artículo de Javascript Date Formatter en mi blog.

Answer 5

Mi respuesta es muy tarde, pero creo que seguir la solución es simple y efectiva para esta pregunta. Esto funciona para mí siempre

Aqui tienes :

function dateToYMD (date) {var d = date.getDate (); var m = date.getMonth () + 1; var y = date.getFullYear (); return '''' + (d <= 9? ''0'' + d: d) + ''-'' + (m <= 9? ''0'' + m: m) + ''-'' + y; }