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  • JDDayOfWeek()

    (PHP 4, PHP 5, PHP 7)

    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
    ModeMeaning
    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。

    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.

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