JDDayOfWeek

(PHP 4, PHP 5, PHP 7, PHP 8)

JDDayOfWeek — 返回星期的日期

说明

jddayofweek(int $julianday, int $mode = CAL_DOW_DAYNO): mixed

返回星期的日期，根据模式不同可能是字符串或是整数。

参数

julianday

一个julian天数。

mode

**历法星期模式**
Mode	Meaning
0 (默认)	返回数字形式(0=Sunday, 1=Monday, etc)
1	返回字符串形式 (English-Gregorian)
2	返回缩写形式的字符串 (English-Gregorian)

返回值

数字或字符串形式的星期数。

add a note

User Contributed Notes 2 notes

down

phimuskapsi at gmail dot com ¶

1 year ago


When using mode 1 or 2, the number returned will NOT match mode 0. 

jddayofweek(0, 1) = 'Monday' not 'Sunday' as expected. 

This can cause discordance between the UI and the value saved.

down

-1

kevind at communitycolor dot com ¶

5 years ago


You need to check to see how your client wants to represent the day of week. This function returns 0 for Sundays. ISO 8601 uses 7 for Sundays.

BTW, You can also calculate the day of week with modular division:

$dow = (1 + $julianday) % 7; // returns 0 for Sundays.
$dow = ($julianday % 7) + 1; // returns 7 for Sundays.

https://en.wikipedia.org/wiki/Julian_day#Finding_day_of_week_given_Julian_day_number

To make matters confusing. The Julian Date starts at noon UTC. Some programs such as SQLITE3 use real numbers to record date and time. If you pass this function a float; it will return a different day of week for the morning than for the afternoon.

When given a julianday with a decimal part you will need to add a half day and may need further adjustment for your timezone.

add a note

官方地址：https://www.php.net/manual/en/function.jddayofweek.php

有任何技术问题请点击这里网站运营推广招聘

IT PHP 编程语言 Linux 开发编程科技 Elasticsearch HTML/CSS/XML 网络 JAVA NoSQL 数据库面试 C/C++ Golang Git 算法操作系统正则表达式 Redis 互联网 MySql JavaScript 运维软件国际架构设计 Mac OS TCP/IP Excel Vim Windows Socket Oracle VR MongoDB Python 运营 MemCache 商业硬件电子娱乐设计 nginx 摄影游戏 WordPress HTTP 团建数码电器

php7 安装fileinfo扩展 preg_split — 通过一个正则表达式分隔字符串 php位值,解决 PHP 中 usort 在值相同时改变原始位置的问题 [PHP] inet_pton/inet_ntop IP地址转换函数 array_multisort() 多字段排序 PHPMailer设置utf8 PHPMailer字符集CharSet ADORecordSet对象 adodb手册 PHP 8.1 [鸟哥]PHP_INT_MIN 和 -9223372036854775808 opcache预加载 Composer的Packagist资源 mysql面试题 [鸟哥]PHP FFI详解 - 一种全新的PHP扩展方式 PHP7添加redis扩展 PHP mkdir()写出来的权限与mode值不符合 Packagist / Composer 中国全量镜像 php中几种注释规范利用php soap实现web service PHP获取指定函数定义在哪个文件中及行号

略微加速

PHP官方手册 - 互联网笔记

JDDayOfWeek

说明

参数

返回值

User Contributed Notes 2 notes