(PHP 5 >= 5.5.1, PHP 7, PHP 8)

IntlCalendar::setMinimalDaysInFirstWeekSet minimal number of days the first week in a year or month can have


Object-oriented style

public IntlCalendar::setMinimalDaysInFirstWeek(int $days): true

Procedural style

intlcal_set_minimal_days_in_first_week(IntlCalendar $calendar, int $days): true

Sets the smallest number of days the first week of a year or month must have in the new year or month. For instance, in the Gregorian calendar, if this value is 1, then the first week of the year will necessarily include January 1st, while if this value is 7, then the week with January 1st will be the first week of the year only if the day of the week for January 1st matches the day of the week returned by IntlCalendar::getFirstDayOfWeek(); otherwise it will be the previous yearʼs last week.



An IntlCalendar instance.


The number of minimal days to set.

Return Values

Always returns true.


ValueError if days is out of range (less than 1 or more than 7).


Version Description
8.0.0 A ValueError is now thrown on invalid input. Previously, false was returned.

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