d_lite_lshift    6063 ext/date/date_core.c     return d_lite_lshift(self, n);
d_lite_lshift    6097 ext/date/date_core.c     return d_lite_lshift(self, f_mul(n, INT2FIX(12)));
d_lite_lshift    9353 ext/date/date_core.c     rb_define_method(cDate, "<<", d_lite_lshift, 1);