End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Date#julian?
d.julian? → bool
ext/date/date_core.c
View on GitHub ↗
static VALUE
d_lite_julian_p(VALUE self)
{
get_d1(self);
return f_boolcast(m_julian_p(dat));
}
Returns true if the date is before the day of calendar reform.
Example
Date.new(1582,10,15).julian? #=> false (Date.new(1582,10,15) - 1).julian? #=> true