This article describes how to use jQuery to get future dates, such as calculating the date after the current date. If you are not sure how to get the current date, please refer to the following method.

Use jQuery to check if the date is a future date

The following function checks whether a given date is in the future:

function isFutureDate() {
    let date = new Date();
    date.setFullYear(2020, 1, 1); // 設(shè)置一個(gè)示例未來(lái)日期
    let now = new Date();
    return date > now; // 返回布爾值，true表示是未來(lái)日期
}

Check whether the year is four digits

This function checks whether the date and month of the date are double digits and whether the year is four digits:

function twodigits(digits) {
    return (digits > 9) ? digits : '0' + digits;
}

Full code example

The following code gets the current date and calculates the date after 7 days:

let fullDate = new Date();
let twoDigitDays = twodigits(fullDate.getDate());
let twoDigitMonth = twodigits(fullDate.getMonth() + 1);

let departDate = twoDigitDays + "/" + twoDigitMonth + "/" + fullDate.getFullYear();
console.log("出發(fā)日期:", departDate);

fullDate.setDate(fullDate.getDate() + 7);
twoDigitDays = twodigits(fullDate.getDate());
twoDigitMonth = twodigits(fullDate.getMonth() + 1);

let returnDate = twoDigitDays + "/" + twoDigitMonth + "/" + fullDate.getFullYear();
console.log("返回日期:", returnDate);

Another code example

This example demonstrates more complex date calculations and formatting:

let currentDate = new Date();
let currentMonth = currentDate.getMonth() + 1;
let lastDayOfMonth = new Date(currentDate.getFullYear(), currentDate.getMonth(), 0).getDate();
let departureDate = futureDateDays(14); // 假設(shè)futureDateDays函數(shù)計(jì)算14天后的日期
let depDate = departureDate.split('/');
let departureDateMonth = parseInt(depDate[1]);

if (departureDateMonth !== currentMonth) {
    departureDate = leadingZero(currentMonth) + '/' + leadingZero(lastDayOfMonth) + '/' + depDate[2];
}
console.log("出發(fā)日期:", departureDate);

// 使用字符串格式 mm/dd/yyyy 將其轉(zhuǎn)換回日期
let validDate = new Date(departureDate);
// 然后轉(zhuǎn)換回字符串
departureDate = leadingZero(validDate.getDate()) + '/' + leadingZero(validDate.getMonth() + 1) + '/' + validDate.getFullYear();

// 輸出示例：
// 09/30/2023
// Date { ... }
// 10/01/2023

(Suppose the futureDateDays and leadingZero functions are defined, used to calculate future dates and add leading zeros before numbers, respectively)

jQuery Date and Future Date FAQs (FAQs)

• How to use jQuery to check if a date is a future date? Use JavaScript Date objects to compare the timestamps of the current date and the target date.

• How to set the date for the next 10 days using jQuery? The Date method using the setDate object.

• How to format future dates as "dd-mm-yyyy" using jQuery? Use the Date, getDate and getMonth methods of the getFullYear object and do string splicing.

• How to use jQuery to verify that the date entered by the user is a future date? Get user input, create Date objects and compare.

• How to use jQuery to check if a date is a current date or a future date? Use the toDateString method to compare date strings, or compare timestamps.

Please note that in the above code examples, the futureDateDays and leadingZero functions need to be implemented by themselves according to actual needs. These functions simplify the date calculation and formatting process.

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