M1 garands, and most other US military rifles are not dated by date of manufacture. You MAY be able to determine the month and year of the manufacture of your Garand receiver by checking the serial number of the receiver at several websites that have that information.
http://www.fulton-armory.com/tea/m1serial.htm
That one is as good as any of them.
You will also find that unlike many other nation's military rifles, US rifles do not have a myriad of parts marked with "matching serial numbers". Usually the best you can do with a US rifle is match the individual part's manufacturer's codes and/or "drawing numbers" to determine if your rifle is "correct".
Congrats on your new purchase and post some pics when you can