如何获得2位数的年份 w/Javascript？

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Given a date object:

date.getFullYear().toString().substr(2,2);

It returns the number as string. If you want it as integer just wrap it inside the parseInt() function:

var twoDigitsYear = parseInt(date.getFullYear().toString().substr(2,2), 10);

Example with the current year in one line:

var twoDigitsCurrentYear = parseInt(new Date().getFullYear().toString().substr(2,2));

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var d = new Date();
var n = d.getFullYear();

Yes, n will give you the 4 digit year, but you can always use substring or something similar to split up the year, thus giving you only two digits:

var final = n.toString().substring(2);

This will give you the last two digits of the year (2013 will become 13, etc...)

If there's a better way, hopefully someone posts it! This is the only way I can think of. Let us know if it works!

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var currentYear =  (new Date()).getFullYear();
var twoLastDigits = currentYear%100;


var formatedTwoLastDigits = "";


if (twoLastDigits <10 ) {
formatedTwoLastDigits = "0" + twoLastDigits;
} else {
formatedTwoLastDigits = "" + twoLastDigits;
}

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another version:

var yy = (new Date().getFullYear()+'').slice(-2);

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最佳答案

The specific answer to this question is found in this one line below:

//pull the last two digits of the year
//logs to console
//creates a new date object (has the current date and time by default)
//gets the full year from the date object (currently 2017)
//converts the variable to a string
//gets the substring backwards by 2 characters (last two characters)
console.log(new Date().getFullYear().toString().substr(-2));

Formatting Full Date Time Example, Single Function (MMddyy):

JavaScript:

//A function for formatting a date to MMddyy
function formatDate(d)
{
//get the month
var month = d.getMonth();
//get the day
//convert day to string
var day = d.getDate().toString().padStart(2, '0');
//get the year
var year = d.getFullYear();
    

//pull the last two digits of the year
year = year.toString().substr(-2);
    

//increment month by 1 since it is 0 indexed
//converts month to a string
month = (month + 1).toString().padStart(2, '0');


//return the string "MMddyy"
return month + day + year;
}


var d = new Date();
console.log(formatDate(d));

Formatting Full Date Example, multiple functions (MMddyy):

// function getMonth with 1 parameter expecting date
// This function returns a string of type MM (example: 05 = May)
function getMonth(d) {
//get the month
var month = d.getMonth();
    

//increment month by 1 since it is 0 indexed
//converts month to a string
//if month is 1-9 pad right with a 0 for two digits
month = (month + 1).toString().padStart(2, '0');
    

return month;
}


// function getDay with 1 parameter expecting date
// This function returns a string of type dd (example: 09 = The 9th day of the month)
function getDay(d) {
//get the day
//convert day to string
//if day is between 1-9 pad right with a 0 for two digits
var day = d.getDate().toString().padStart(2, '0');;
    

return day;
}


// function getYear with 1 parameter expecting date
// This function returns the year in format yy (example: 21 = 2021)
function getYear(d) {
//get the year
var year = d.getFullYear();
    

//pull the last two digits of the year
year = year.toString().substr(-2);
    

return year;
}


//A function for formatting a date to MMddyy
function formatDate(d)
{
//return the string "MMddyy"
return getMonth(d) + getDay(d) + getYear(d);
}


var d = new Date();
console.log(formatDate(d));

Answers for full browser support (Internet Explorer)

Formatting Full Date Time Example, Single Function (MMddyy): jsFiddle

JavaScript:

//A function for formatting a date to MMddyy
function formatDate(d)
{
//get the month
var month = d.getMonth();
//get the day
//convert day to string
var day = d.getDate().toString();
//get the year
var year = d.getFullYear();
    

//pull the last two digits of the year
year = year.toString().substr(-2);
    

//increment month by 1 since it is 0 indexed
//converts month to a string
month = (month + 1).toString();


//if month is 1-9 pad right with a 0 for two digits
if (month.length === 1)
{
month = "0" + month;
}


//if day is between 1-9 pad right with a 0 for two digits
if (day.length === 1)
{
day = "0" + day;
}


//return the string "MMddyy"
return month + day + year;
}


var d = new Date();
console.log(formatDate(d));

Formatting Full Date Example, multiple functions (MMddyy):

// function getMonth with 1 parameter expecting date
// This function returns a string of type MM (example: 05 = May)
function getMonth(d) {
//get the month
var month = d.getMonth();
    

//increment month by 1 since it is 0 indexed
//converts month to a string
month = (month + 1).toString();


//if month is 1-9 pad right with a 0 for two digits
if (month.length === 1)
{
month = "0" + month;
}
    

return month;
}


// function getDay with 1 parameter expecting date
// This function returns a string of type dd (example: 09 = The 9th day of the month)
function getDay(d) {
//get the day
//convert day to string
var day = d.getDate().toString();
    

//if day is between 1-9 pad right with a 0 for two digits
if (day.length === 1)
{
day = "0" + day;
}
    

return day;
}


// function getYear with 1 parameter expecting date
// This function returns the year in format yy (example: 21 = 2021)
function getYear(d) {
//get the year
var year = d.getFullYear();
    

//pull the last two digits of the year
year = year.toString().substr(-2);
    

return year;
}


//A function for formatting a date to MMddyy
function formatDate(d)
{
//return the string "MMddyy"
return getMonth(d) + getDay(d) + getYear(d);
}


var d = new Date();
console.log(formatDate(d));