End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Date#sunday?
d.sunday? → bool
ext/date/date_core.c
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static VALUE
d_lite_sunday_p(VALUE self)
{
get_d1(self);
return f_boolcast(m_wday(dat) == 0);
}
Returns true if the date is Sunday.