How to know the manufacture's date of an automobile battery before buying it?

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Brief document on how to locate the date of manufacture of an automobile battery, some have it silkscreened in the superior part in a lateral part, some in a terminal with die-cut numbering, but the majority of batteries have it indicated in the worst place and the most uncomfortable and complicated to review, IN THE BASE OF THE BATTERY.

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The example battery in this document was purchased and installed on 04/12/2016 as seen in the photo (When I install them in the car, I put a dymo tape with the date of installation. Now we will see how to see when it was manufactured.)

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In several brands of batteries, the manufacturers place the date of manufacture on the base of the battery, so it is quite difficult to check that date easily, it is indicated in 2 circles with a numbering and a date.

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Detail photos of the 2 circles.

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The circle on the left side, numbered from 1 to 12, indicates the MONTH OF CONSTRUCTION, in this example, 6 = JUNE.