How to compare a fixed date stored in an object with the current date in JavaScript?


Below is the fixed date stored in an object, write a function that compares a date with the current date:

const docData = {
  DateTransport: "2022-01-01",
  TypeHeureDepart: "02:15",
};

I wrote the below solution but I think there may be a time zone problem?

const docData = {
  DateTransport: "2022-01-01",
  TypeHeureDepart: "02:15",
};
// true: past ; false: now or future
const docDataDate = new Date(2022, 0, 1, 2, 15, 0, 0);
const currentDate = new Date();

function checkTime() {
  if (docDataDate >= currentDate) return false;
  return true;
}
console.log(checkTime());

Above solution has some issues below:

a. I shouldn't assign variables outside of the function
b. I didn't use docData
c. The function is not reusable
d. there's no input in this function

// true: past ; false: now or future

const docData = {
  DateTransport: "2022-01-01",
  TypeHeureDepart: "02:15",
};

function checkTime(docData) {
  const { DateTransport, TypeHeureDepart } = docData;
  const docDataDate = new Date(
    `${DateTransport} ${TypeHeureDepart || "00:00"}`
  );

  return new Date() > docDataDate;
}
console.log(checkTime(docData));

There are some important details:

  1. When compared with two date, it needs to be same format
    1.1 if I use concat to connect the strings, it needs to be:
new Date(docData["DateTransport"] +'T'+docData["TypeHeureDepart"]+':00')
or
new Date(docData.DateTransport + "T" + docData.TypeHeureDepart + ":00")

1.2 use template literals: attention to the space or add a "T" in between them

const docDataDate = new Date(
  `${DateTransport} ${TypeHeureDepart || "00:00"}`
);

Reference:

What is a function?

JavaScript Date Object Comparison

Javascript, Time and Date: Getting the current minute, hour, day, week, month, year of a given millisecond time

new Date().getDate()          // Get the day as a number (1-31)
new Date().getDay()           // Get the weekday as a number (0-6)
new Date().getFullYear()      // Get the four digit year (yyyy)
new Date().getHours()         // Get the hour (0-23)
new Date().getMilliseconds()  // Get the milliseconds (0-999)
new Date().getMinutes()       // Get the minutes (0-59)
new Date().getMonth()         // Get the month (0-11)
new Date().getSeconds()       // Get the seconds (0-59)
new Date().getTime()          // Get the time (milliseconds since January 1, 1970)

How to compare Date and Time in JavaScript - Step by Step

JavaScript Date 時間和日期-學習筆記

new Date(2022, 3, 15, 10, 22, 15) 
//Fri Apr 15 2022 10:22:15 GMT+0800

需要知道的JS的日期的知识,都在这了

JS日期时间比较大小(绝对干货)

The Date Object - Getting, Setting & Formatting Dates in JavaScript - Tutorial For Beginners

#interview-question-compare-date






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