Battery date codes Yuasa YBX

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Hi everyone. i must say that this is the BEST place for a Yaris owner to be! So much info for everything, helped me more times that i can remember.
THANK YOU EVERYBODY.

I live in Greece and i have a Yaris 1.0 model year 2000. It is an unbreakable tool.
Yesterday i went to a friend's shop and parked outside with the alarms on, and stayed for about 30 minutes. When i tried to start the car the battery had not enough juice (crak tiktiktitk...!!! )
I think it is time to change the battery, though after i started the car (pushed it and gear in..) the car was ok (no problem starting it up).
Well, to make a long story short, i searched through the web for a new battery, and i decided to go for a YUASA YBX3063. I asked the sales guy to tell me the manufacture date of the battery but he could not tell me, but gave me the date coding that is stamped on the battery :

Two codes were stamped 54D01C2Z & 2101D33 (i guess one is the manufacture date and the other the warranty date (?).

I searched all over the place in the web and couldn't find a way to translate these codes. Anyone can help please?
Thanks alot in advance.