JDDayOfWeek

(PHP 4, PHP 5, PHP 7)

JDDayOfWeekRestituisce il giorno della settimana

Descrizione

mixed jddayofweek ( int $giornogiuliano , int $modo )

Restituisce il giorno della settimana. Può restituire una stringa o un intero a seconda del modo.

Modi
Modo Significato
0 Restituisce il numero del giorno come intero (0=domenica, 1=lunedì, etc)
1 Restituisce una stringa contenente il giorno della settimana (in inglese-gregoriano)
2 Restituisce una stringa contenente il giorno della settimana abbreviato (in inglese-gregoriano)

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kevind at communitycolor dot com
1 year 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.
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