Gematria Calculation Result for code is her birthday j m on Roman Numeral

This is calculated by summing each letter's value: c(100) + o(0) + d(500) + e(0) + (0) + i(1) + s(0) + (0) + h(0) + e(0) + r(0) + (0) + b(0) + i(1) + r(0) + t(0) + h(0) + d(500) + a(0) + y(0) + (0) + j(0) + (0) + m(1000).