Returns the month in range (1..12):
Date.new(2001, 2, 3).mon # => 2
Returns:
5333 5334 5335 5336 5337 5338
# File 'date_core.c', line 5333 static VALUE d_lite_mon(VALUE self) { get_d1(self); return INT2FIX(m_mon(dat)); }