I am using moment.js. I want to restrict the user son that he can only select a date which is from current date to 50 years before. In short, i just want that user's date of birth cannot be more than 50 years. So, from the current date, only ranges before the 50 years should only be there. How can i do so? please guide me.

CodePudding user response：

So you have to calculate 50 years back date first https://momentjs.com/docs/#/manipulating/subtract/

fiftyYearsBackDate = moment().subtract(50, "years")

Get user Selected date

userDate = new Date()

Create moment object from that and do query https://momentjs.com/docs/#/query/is-after/

moment(userDate).isAfter(fiftyYearsBackDate)

this will return boolean that you can use to show the error message.

CodePudding user response：

You want to calculate the difference in years between now and the birthdate, and check if it's bigger than 50.

const birthDate = '1970-01-01'
const yearsDiff = moment().diff(birthDate, 'years'); 

If you want to get the difference of years in decimal:

const yearsDiff = moment().diff(birthDate, 'years', true); 

The yearsDiff will contain the difference, so you can do an if check on it to see if it's bigger than 50.

Official docs for this: https://momentjs.com/docs/#/displaying/difference/

CodePudding user response：

By using moment js you can easily get past and future dates like this -

const past = moment().subtract(50, 'years'); // To past
const future = moment().add(50, 'years'); // Back to future

Finally

const today = moment();
moment(today).isAfter(past, 'year'); // return: true || false

The reference site URL is - https://everyday.codes/javascript/how-to-format-date-in-javascript-with-moment-js/