Editing Day of week (section)

== Weekday ==
The value of weekday obtained from different approaches.

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! style="text-align:right;" | Weekday values from different approaches
! Sunday
! Monday
! Tuesday
! Wednesday
! Thursday
! Friday
! Saturday
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! [http://php.net/manual/en/function.date.php PHP date] with N format character: Weekday ([https://en.wikipedia.org/wiki/ISO_week_date ISO-8601])
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! [https://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html#function_weekday MySQL WEEKDAY() function]
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! [https://www.w3schools.com/sql/func_mysql_dayofweek.asp MySQL DAYOFWEEK() Function]
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! [https://support.office.com/zh-tw/article/WEEKDAY-%E5%87%BD%E6%95%B8-60e44483-2ed1-439f-8bd0-e404c190949a Excel WEEKDAY() function]
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! [http://php.net/manual/en/function.date.php PHP date] with w format character
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