2nd/10_Wiki/Topic_JavaScript/JavaScript_Date_Get.md

---
id: javascript-date-get-methods
title: "JavaScript Date Get Methods"
category: "Frontend"
status: "draft"
verification_status: "conceptual"
canonical_id: ""
aliases: ["Date getters", "getFullYear", "getMonth", "getDate", "getTime", "Date.now", "getTimezoneOffset"]
duplicate_of: ""
source_trust_level: "B"
confidence_score: 0.9
created_at: 2026-06-23
updated_at: 2026-06-23
review_reason: ""
merge_history: []
tags: ["javascript", "js", "web", "frontend", "w3schools", "date", "getter"]
raw_sources: ["https://www.w3schools.com/js/js_date_methods.asp"]
applied_in: []
github_commit: ""
---

# [[JavaScript Date Get Methods]]

## 🎯 한 줄 통찰 (One-line insight)
Date Get methods read individual parts out of a `Date` object — year, month, day, weekday, hours, minutes, seconds, milliseconds, and the underlying timestamp — with month and weekday returned as zero-based numbers. [S1]

## 🧠 핵심 개념 (Core concepts)
- **`new Date()` creates a date object** holding a date and time. Get methods then extract individual components from it. [S1]
- **Months are zero-based** — `getMonth()` returns `0-11`, where January is 0. [S1]
- **Weekdays are zero-based** — `getDay()` returns `0-6`, where Sunday is 0. [S1]
- **`getTime()` returns the timestamp** — milliseconds since January 1, 1970. [S1]
- **`Date.now()` is a static method** that returns the current milliseconds since January 1, 1970 (it is a method of `Date`, not of a date instance). [S1]
- **`getTimezoneOffset()`** returns the difference, in minutes, between local time and UTC. UTC time is the same as GMT. [S1]
- **`getYear()` is deprecated** — old code may use it to return a 2-digit year; do not use it. [S1]

## 🧩 추출된 패턴 (Extracted patterns)
- **Number-to-name lookup** — because `getMonth()`/`getDay()` return zero-based numbers, map them to readable names through an array indexed by that number. [S1]
- **Hardcoded vs current date** — the same getter works on a parsed literal (`new Date("2021-03-25")`) or on the current moment (`new Date()`). [S1]
- **Derive durations from timestamps** — divide `Date.now()` by a precomputed unit (ms per year) to estimate elapsed time. [S1]

## 📖 세부 내용 (Details)
**Creating a date object** [S1]
```javascript
const date = new Date();
```

**getFullYear() — year as a four digit number (yyyy)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getFullYear();
```
```javascript
const d = new Date();
d.getFullYear();
```

**getMonth() — month as a number (0-11)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getMonth();
```
```javascript
const d = new Date();
d.getMonth();
```
You can use an array of names to return the month as a name: [S1]
```javascript
const months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

const d = new Date("2021-03-25");
let month = months[d.getMonth()];
```
```javascript
const months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];

const d = new Date();
let month = months[d.getMonth()];
```

**getDate() — day as a number (1-31)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getDate();
```
```javascript
const d = new Date();
d.getDate();
```

**getHours() — hour (0-23)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getHours();
```
```javascript
const d = new Date();
d.getHours();
```

**getMinutes() — minute (0-59)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getMinutes();
```
```javascript
const d = new Date();
d.getMinutes();
```

**getSeconds() — second (0-59)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getSeconds();
```
```javascript
const d = new Date();
d.getSeconds();
```

**getMilliseconds() — millisecond (0-999)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getMilliseconds();
```
```javascript
const d = new Date();
d.getMilliseconds();
```

**getDay() — weekday as a number (0-6)** [S1]
```javascript
const d = new Date("2021-03-25");
d.getDay();
```
```javascript
const d = new Date();
d.getDay();
```
You can use an array of names to return the weekday as a name: [S1]
```javascript
const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

const d = new Date("2021-03-25");
let day = days[d.getDay()];
```
```javascript
const days = ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"];

const d = new Date();
let day = days[d.getDay()];
```

**getTime() — milliseconds since January 1, 1970** [S1]
```javascript
const d = new Date("1970-01-01");
d.getTime();
```
```javascript
const d = new Date("2021-03-25");
d.getTime();
```
```javascript
const d = new Date();
d.getTime();
```

**Date.now() — current milliseconds since January 1, 1970** [S1]
```javascript
let ms = Date.now();
```
Calculate the number of years since 1970: [S1]
```javascript
const minute = 1000 * 60;
const hour = minute * 60;
const day = hour * 24;
const year = day * 365;

let years = Math.round(Date.now() / year);
```

**getTimezoneOffset() — difference between local time and UTC, in minutes** [S1]
```javascript
let diff = d.getTimezoneOffset();
```

**Date Get Methods** [S1]

| Method | Description |
|--------|-------------|
| getFullYear() | Get **year** as a four digit number (yyyy) |
| getMonth() | Get **month** as a number (0-11) |
| getDate() | Get **day** as a number (1-31) |
| getDay() | Get **weekday** as a number (0-6) |
| getHours() | Get **hour** (0-23) |
| getMinutes() | Get **minute** (0-59) |
| getSeconds() | Get **second** (0-59) |
| getMilliseconds() | Get **millisecond** (0-999) |
| getTime() | Get **time** (milliseconds since January 1, 1970) |

**UTC Date Get Methods** — UTC time is the same as GMT. [S1]

| Method | Same As | Description |
|--------|---------|-------------|
| getUTCDate() | getDate() | Returns the UTC date |
| getUTCFullYear() | getFullYear() | Returns the UTC year |
| getUTCMonth() | getMonth() | Returns the UTC month |
| getUTCDay() | getDay() | Returns the UTC day |
| getUTCHours() | getHours() | Returns the UTC hour |
| getUTCMinutes() | getMinutes() | Returns the UTC minutes |
| getUTCSeconds() | getSeconds() | Returns the UTC seconds |
| getUTCMilliseconds() | getMilliseconds() | Returns the UTC milliseconds |

## 🛠️ 적용 사례 (Applied in summary)
The page's own snippets are the canonical applied examples — reading components off both a parsed literal date and the current date, and converting zero-based month/weekday numbers to names via lookup arrays. No external project/commit applications found in the source.

## 💻 코드 패턴 (Code patterns)
Convert a zero-based month number to a readable name (language: JavaScript):
```javascript
const months = ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"];
const d = new Date();
let month = months[d.getMonth()];
```
Get the current timestamp:
```javascript
let ms = Date.now();
```

## ⚖️ 모순 및 업데이트 (Contradictions & updates)
The source flags `getYear()` as deprecated and non-standard; `getFullYear()` is the standard replacement. 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:** 0.90
- **중복 검사 결과:** 신규 생성 (New discovery)

## 🔗 지식 그래프 (Knowledge Graph)
- **상위/루트:** [[JavaScript Tutorial]]
- **관련 개념:** [[JavaScript Date Set Methods]], [[JavaScript Date Methods]], [[JavaScript Dates]]
- **참조 맥락:** Used whenever reading date/time parts out of a Date object for display or computation.

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

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