2nd/10_Wiki/Topic_JavaScript/JavaScript_Date_Methods.md

---
id: javascript-date-methods
title: "JavaScript Date Methods"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Date reference", "Date object methods", "Date prototype", "Date.parse", "Date.UTC", "toISOString"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.88
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["javascript", "js", "web", "frontend", "w3schools", "date", "reference"]
raw_sources: ["https://www.w3schools.com/js/js_date_reference.asp"]
applied_in: []
github_commit: ""
---

# [[JavaScript Date Methods]]

## 🎯 한 줄 통찰 (One-line insight)
This is the complete reference of `Date` object members — constructor/properties, get and set methods (local and UTC), utility statics, and string-conversion methods — the master index behind the more focused Date tutorials. [S1]

## 🧠 핵심 개념 (Core concepts)
- **The Date API splits into families** — constructor/properties, Get methods, Set methods, utility statics, and string-conversion methods. [S1]
- **Every Get/Set field has a UTC counterpart** — e.g. `getDate()` / `getUTCDate()`, `setHours()` / `setUTCHours()`. [S1]
- **Static utility methods** — `now()`, `parse()`, and `UTC()` are called on `Date` itself and work with millisecond timestamps. [S1]
- **Many conversion methods** — `toString()`, `toISOString()`, `toDateString()`, `toLocaleString()`, and others render a Date as a string in different formats/locales. [S1]
- **Deprecated members** — `getYear()`/`setYear()` (use `getFullYear()`/`setFullYear()`) and `toGMTString()` (use `toUTCString()`). [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Local vs UTC symmetry** — for any field, pick the plain method for local time or the `UTC` variant for universal time. [S1]
- **Static parsing/construction** — turn strings or component lists into timestamps with `Date.parse()` and `Date.UTC()`, current time with `Date.now()`. [S1]
- **Choose a string formatter by need** — ISO (`toISOString`), JSON (`toJSON`), locale-aware (`toLocale*String`), or date/time-only (`toDateString`, `toTimeString`). [S1]

## 📖 세부 내용 (Details)
This page is a reference index of `Date` methods and properties grouped by family. No "Example" code boxes were present to capture; the content is the reference tables below. [S1]

**Date Constructor & Properties** [S1]

| Method/Property | Description |
|---|---|
| new Date() | Creates a new Date object |
| constructor | Returns the function that created the Date prototype |
| prototype | Allows you to add properties and methods to an object |

**Date Get Methods** [S1]

| Method | Description |
|---|---|
| getDate() | Returns the day of the month (from 1-31) |
| getDay() | Returns the day of the week (from 0-6) |
| getFullYear() | Returns the year |
| getHours() | Returns the hour (from 0-23) |
| getMilliseconds() | Returns the milliseconds (from 0-999) |
| getMinutes() | Returns the minutes (from 0-59) |
| getMonth() | Returns the month (from 0-11) |
| getSeconds() | Returns the seconds (from 0-59) |
| getTime() | Returns the number of milliseconds since midnight Jan 1 1970 |
| getTimezoneOffset() | Returns the time difference between UTC time and local time, in minutes |
| getUTCDate() | Returns the day of the month, according to universal time (1-31) |
| getUTCDay() | Returns the day of the week, according to universal time (0-6) |
| getUTCFullYear() | Returns the year, according to universal time |
| getUTCHours() | Returns the hour, according to universal time (from 0-23) |
| getUTCMilliseconds() | Returns the milliseconds, according to universal time (0-999) |
| getUTCMinutes() | Returns the minutes, according to universal time (from 0-59) |
| getUTCMonth() | Returns the month, according to universal time (from 0-11) |
| getUTCSeconds() | Returns the seconds, according to universal time (from 0-59) |
| getYear() | Deprecated. Use getFullYear() instead |

**Date Set Methods** [S1]

| Method | Description |
|---|---|
| setDate() | Sets the day of the month of a date object |
| setFullYear() | Sets the year of a date object |
| setHours() | Sets the hour of a date object |
| setMilliseconds() | Sets the milliseconds of a date object |
| setMinutes() | Set the minutes of a date object |
| setMonth() | Sets the month of a date object |
| setSeconds() | Sets the seconds of a date object |
| setTime() | Sets a date to a specified number of milliseconds after/before January 1, 1970 |
| setUTCDate() | Sets the day of the month of a date object, according to universal time |
| setUTCFullYear() | Sets the year of a date object, according to universal time |
| setUTCHours() | Sets the hour of a date object, according to universal time |
| setUTCMilliseconds() | Sets the milliseconds of a date object, according to universal time |
| setUTCMinutes() | Set the minutes of a date object, according to universal time |
| setUTCMonth() | Sets the month of a date object, according to universal time |
| setUTCSeconds() | Set the seconds of a date object, according to universal time |
| setYear() | Deprecated. Use setFullYear() instead |

**Date Utility Methods** [S1]

| Method | Description |
|---|---|
| now() | Returns the number of milliseconds since midnight Jan 1, 1970 |
| parse() | Parses a date string and returns milliseconds since January 1, 1970 |
| UTC() | Returns the number of milliseconds in a date since midnight of January 1, 1970 |

**Date String Conversion Methods** [S1]

| Method | Description |
|---|---|
| toDateString() | Converts the date portion of a Date object into a readable string |
| toGMTString() | Deprecated. Use toUTCString() instead |
| toISOString() | Returns the date as a string, using the ISO standard |
| toJSON() | Returns the date as a string, formatted as a JSON date |
| toLocaleDateString() | Returns the date portion of a Date object as a string, using locale conventions |
| toLocaleTimeString() | Returns the time portion of a Date object as a string, using locale conventions |
| toLocaleString() | Converts a Date object to a string, using locale conventions |
| toString() | Converts a Date object to a string |
| toTimeString() | Converts the time portion of a Date object to a string |
| toUTCString() | Converts a Date object to a string, according to universal time |
| valueOf() | Returns the primitive value of a Date object |

## 🛠️ 적용 사례 (Applied in summary)
As a reference page it has no worked examples; it is the lookup table consulted when picking the right Date method. Worked examples live in the focused tutorials ([[JavaScript Date Get Methods]], [[JavaScript Date Set Methods]]). No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Not found in source — this reference page contains no "Example" code boxes; only the method/property tables above. [S1]

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
The reference marks `getYear()`/`setYear()` and `toGMTString()` as deprecated, pointing to `getFullYear()`/`setFullYear()` and `toUTCString()` respectively. No other contradictions found in the source. [S1]

## ✅ 검증 상태 및 신뢰도
- **상태:** draft
- **검증 단계:** conceptual (실제 적용 사례 발견 시 applied/validated로 승격 가능)
- **출처 신뢰도:** B (W3Schools — widely used educational reference, not a primary standards body)
- **신뢰 점수:** 0.88
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[JavaScript Tutorial]]
- **관련 개념:** [[JavaScript Date Get Methods]], [[JavaScript Date Set Methods]], [[JavaScript Dates]]
- **참조 맥락:** The master index of the Date object — consulted to find the exact method name and signature.

## 📚 출처 (Sources)
- [S1] W3Schools — JavaScript Date Methods — https://www.w3schools.com/js/js_date_reference.asp

## 📝 변경 이력 (Change history)
- 2026-06-23: Initial draft synthesized from the W3Schools "JavaScript Date Methods" page (Astra wiki-curation, P-Reinforce v3.1 format).