BQ40Z50 Manufacture Date

Hi,

 I have been communicating with bq40z50 battery through i2c of MSP430f5338. In this i am reading the manufacture date as 33 by sending the command as 0x1B.

My question is how can we convert the manufacture date from this value to calender format (DD:MM:YEAR). In the referemce manual

SLUUA43–December 2013  they would given the formula as

ManufacturerDate() value in the following format:Day + Month*32 + (Year–1980)*256

I am not able to get any idea to convert the read value (33) to the calender format by using this formula. Can anyone know this?

Thanks in advance.