Century was first released only 2-3 years ago, iirc, so those dates don’t sound right. I’ve seen it hit the markets (in the US) only a couple of times since then so probably you should just assume they are from either 2017-18.
I have one tin of Germain's Century; its codes are 022A021 on the top & 22A021 on the bottom label:
I purchased it at my local tobacconist on 18 May 2018; it was on the shelf for less than a week. I suspect that it was manufactured in early 2018.
I think that all Germain's & Esoterica code's terminal 3 digits represent, not the month & day, but the numerical day of the year.
The 021 would be 21 January, & your 061 would be 2 March.