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- Topic_Graphic → Domain_Design
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- Topic_General → Domain_General
- _Common 신설: Math(구 Topic_Math_Specialty), Reasoning(구 General/From_Thinking & Reasoning),
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- 에이전트→폴더 매핑은 workspace의 .astra/agent-knowledge-map.json (9개 에이전트)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-07-11 11:05:56 +09:00

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id, title, category, status, verification_status, canonical_id, aliases, duplicate_of, source_trust_level, confidence_score, created_at, updated_at, review_reason, merge_history, tags, raw_sources, applied_in, github_commit
id title category status verification_status canonical_id aliases duplicate_of source_trust_level confidence_score created_at updated_at review_reason merge_history tags raw_sources applied_in github_commit
php-date PHP Date Programming_Language draft conceptual
date()
strtotime()
PHP 날짜와 시간
B 0.9 2026-07-04 2026-07-04
php
programming
w3schools
date
time
https://www.w3schools.com/php/php_date.asp

PHP Date

🎯 한 줄 통찰 (One-line insight)

strtotime() accepts natural-language relative expressions like "+2 weeks 4 days 2 hours 20 seconds" or "last Sunday" and correctly parses them into Unix timestamps — but the source explicitly warns it "is not perfect," meaning arbitrary human phrasing should always be verified rather than trusted blindly. [S1]

🧠 핵심 개념 (Core concepts)

  • date(format, timestamp) — formats a timestamp (or "now" if omitted) into a readable string. [S1]
  • Format charactersd/j (day), m (month, 2-digit), Y (year, 4-digit), l (weekday name), F (month name), H/h (24/12-hour), i (minutes), s (seconds), a (am/pm). [S1]
  • date_default_timezone_set() / _get() — sets/reads the timezone used by all date/time functions in the script. [S1]
  • mktime(hour, minute, second, month, day, year) — returns the Unix timestamp for a specific date/time. [S1]
  • time() — current time as a Unix timestamp. [S1]
  • strtotime(datetime_string, basetimestamp) — parses an English textual date/time description into a Unix timestamp; supports relative expressions. [S1]

📖 세부 내용 (Details)

  • Multiple date formats: echo date("Y/m/d"); echo date("Y.m.d"); echo date("Y-m-d"); echo date("l"); echo date('l, F j, Y');. [S1]
  • Automatic copyright year: &copy; 2010-<?php echo date("Y");?>. [S1]
  • Timezone-aware: date_default_timezone_set("America/New_York"); echo date("Y-m-d H:i:s");. [S1]
  • mktime for a specific historical date: date_default_timezone_set("UTC"); $d = mktime(0, 0, 0, 10, 3, 1975); echo "October 3, 1975 was on a " . date("l", $d);. [S1]
  • Relative date parsing: $d = strtotime("+2 weeks 4 days 2 hours 20 seconds"); echo date("Y-m-d H:i:s", $d);. [S1]
  • Iterative date generation (next 6 Saturdays): $startdate = strtotime("Saturday"); $enddate = strtotime("+6 weeks", $startdate); while ($startdate < $enddate) { echo date("M d", $startdate) . "<br>"; $startdate = strtotime("+1 week", $startdate); }. [S1]

⚖️ 모순 및 업데이트 (Contradictions & updates)

  • strtotime()의 불완전성 경고: 자연어 날짜 문자열 파싱이 완벽하지 않으므로 입력 문자열을 항상 검증해야 한다는 팁이 명시됨. [S1]

🛠️ 적용 사례 (Applied in summary)

현재 발견된 실제 적용 사례가 없습니다 — 저작권 연도를 date("Y")로 자동 갱신하는 것이 웹사이트 실전 적용의 대표 사례다. [S1]

💻 코드 패턴 (Code patterns)

Relative date parsing with strtotime() (PHP):

$d = strtotime("+2 weeks 4 days 2 hours 20 seconds");
echo "Date is " . date("Y-m-d H:i:s", $d);

검증 상태 및 신뢰도

  • 상태: draft
  • 검증 단계: conceptual
  • 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)

📚 출처 (Sources)

📝 변경 이력 (Change history)

  • 2026-07-04: Initial draft synthesized from the W3Schools "PHP Date and Time" page (Astra wiki-curation, P-Reinforce v3.1 format).