====== Date and Time ======
[[https://www.timeanddate.com/|www.timeanddate.com]]
===== spec =====
  * **UTC**(英文“Coordinated Universal Time”／法文“Temps Universel Coordonné”): **协调世界时**，又称**世界标准时间**或**世界协调时间** [[wp>UTC]]
  * **GMT**(Greenwich Mean Time)[[wp>Greenwich_Mean_Time|GMT]]: **格林尼治标准时间**
  * **CST**: 时区缩写，可表示 
    * 中国标准时间：China Standard Time UT+8:00
    * 美国中部时间：Central Standard Time (USA) UT-6:00
    * 澳大利亚中部时间：Central Standard Time (Australia) UT+9:30
    * 古巴标准时间：Cuba Standard Time UT-4:00
  * ...
===== format spec =====
  * iso8601
  * iso2203
  * rfc3339
===== timezone =====
  * spec
  * ''/etc/timezone''
  * ''/etc/localtime''
  * [[https://www.iana.org/time-zones|时区数据库]]
===== NTP =====
FIXME
===== program language =====
FIXME
  * javascript, moment.js
  * mysql, sql
  * php
  * ...
=== JAVA ===
  * ''LocalDateTime'',''DateTimeFormatter''