Phaladeepika
द्वादशाद्गुणयेल्लब्धा मासाहर्घतिकाः क्रमात् । सप्तविंशति वर्शाणि मण्डलं शोधयेत्पुनः ॥ २८॥
Multiply the remainder by 12 and divide by 27 to get the months, Multiply the remainder by 30 and divide by 27 to get the days and so on to get the Ghatikas etc. Twentyseven years constitute a Mandala. Some reductions have to be made further.
english translation
dvAdazAdguNayellabdhA mAsAharghatikAH kramAt । saptaviMzati varzANi maNDalaM zodhayetpunaH ॥ 28॥
hk transliteration by Sanscript