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

JDDayOfWeekRestituisce il giorno della settimana


jddayofweek(int $giornogiuliano, int $modo): mixed

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

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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User Contributed Notes 2 notes

phimuskapsi at gmail dot com
2 years 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.
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.


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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