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Date()

20157

Date() Date 

const date1 = new Date("December 17, 1995 03:24:00");
// Sun Dec 17 1995 03:24:00 GMT...

const date2 = new Date("1995-12-17T03:24:00");
// Sun Dec 17 1995 03:24:00 GMT...

console.log(date1 === date2);
// Expected output: false

console.log(date1 - date2);
// Expected output: 0

js
new Date()
new Date(value)
new Date(dateString)
new Date(dateObject)

new Date(year, monthIndex)
new Date(year, monthIndex, day)
new Date(year, monthIndex, day, hours)
new Date(year, monthIndex, day, hours, minutes)
new Date(year, monthIndex, day, hours, minutes, seconds)
new Date(year, monthIndex, day, hours, minutes, seconds, milliseconds)

Date()

Date() new

Date()

Date

value

UTC 1970 1 1 00:00:00ECMAScript UNIX UNIX

dateString

Date.parse() ECMA262 ISO 8601 IETF RFC 2822

Date Date.parse ISO 8601 YYYY-MM-DDTHH:mm:ss.ssZ RFC 2822

"1970-01-01" UTC "1970-01-01T12:00"

dateObject

Date Date new Date(dateObject.valueOf()) valueOf()

Date() Date

Date() Date day 1 0 UTC

11 monthIndex 59 minuteshours new Date(1990, 12, 1) 1991 1 1 new Date(2020, 5, 19, 25, 65) 2020 6 20 2:05

new Date(2020, 5, 0) 2020 5 31

year

0 99 1900 1999

monthIndex

0 11

day

1

hours

0 23 0

minutes

0

seconds

0

milliseconds

0

new Date()Date() Date UNIX -8,640,000,000,000 8,640,000,000,000 Date toString() Invalid Date

Date() new new Date().toString() Date() new

Date

JavaScript

js
const today = new Date();
const birthday = new Date("December 17, 1995 03:24:00"); // 
const birthday = new Date("1995-12-17T03:24:00"); //  ISO-8601 
const birthday = new Date(1995, 11, 17); //  0 
const birthday = new Date(1995, 11, 17, 3, 24, 0);
const birthday = new Date(628021800000); //

Date() Date new Date(undefined) new Date()

js
console.log(new Date(undefined)); // Invalid Date

undefined NaNnull 0

js
console.log(new Date(null)); // 1970-01-01T00:00:00.000Z

Array.prototype.toString() ISO 8601 Date()

js
console.log(new Date(["2020-06-19", "17:13"]));
// Chrome  2020-06-19T17:13:00.000Z "2020-06-19,17:13" 
// Firefox  "Invalid Date"

ECMAScript 2027 LanguageSpecification
# sec-date-constructor

MDN

20251023 MDN

GitHub
  1. JavaScript
  2. Date
    1. Date()
    1. Date.now()
    2. Date.parse()
    3. Date.UTC()
    1. Date.prototype.getDate()
    2. Date.prototype.getDay()
    3. Date.prototype.getFullYear()
    4. Date.prototype.getHours()
    5. Date.prototype.getMilliseconds()
    6. Date.prototype.getMinutes()
    7. Date.prototype.getMonth()
    8. Date.prototype.getSeconds()
    9. Date.prototype.getTime()
    10. Date.prototype.getTimezoneOffset()
    11. Date.prototype.getUTCDate()
    12. Date.prototype.getUTCDay()
    13. Date.prototype.getUTCFullYear()
    14. Date.prototype.getUTCHours()
    15. getUTCMilliseconds()
    16. Date.prototype.getUTCMinutes()
    17. Date.prototype.getUTCMonth()
    18. Date.prototype.getUTCSeconds()
    19. Date.prototype.getYear()
    20. Date.prototype.setDate()
    21. Date.prototype.setFullYear()
    22. Date.prototype.setHours()
    23. Date.prototype.setMilliseconds()
    24. Date.prototype.setMinutes()
    25. Date.prototype.setMonth()
    26. Date.prototype.setSeconds()
    27. Date.prototype.setTime()
    28. setUTCDate()
    29. Date.prototype.setUTCFullYear()
    30. Date.prototype.setUTCHours()
    31. Date.prototype.setUTCMilliseconds()
    32. Date.prototype.setUTCMinutes()
    33. Date.prototype.setUTCMonth()
    34. Date.prototype.setUTCSeconds()
    35. Date.prototype.setYear()
    36. Date.prototype.toDateString()
    37. Date.prototype.toISOString()
    38. Date.prototype.toJSON()
    39. Date.prototype.toLocaleDateString()
    40. Date.prototype.toLocaleString()
    41. Date.prototype.toLocaleTimeString()
    42. Date.prototype.toString()
    43. Date.prototype.toTemporalInstant()
    44. Date.prototype.toTimeString()
    45. Date.prototype.toUTCString()
    46. Date.prototype.valueOf()
    47. Date.prototype[Symbol.toPrimitive]
  7. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toString()
    5. Function.prototype[Symbol.hasInstance]()
    1. Function.displayName
    2. Functionlength
    3. Function.name
    4. Function.prototype.prototype
    5. Function.prototype.arguments
    6. Function.prototype.caller
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
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