The wine kits are guaranteed for 1 year from the manufacture date. The date is on the top of the kit and is referred to as the "batch code". Winexpert, Cellar Craft and RJ Spagnols use stickers like the one above. Mosti Mondiale uses 2 small stickers that just have the 5 digit date with one sticker on the outside of the box and one on the cap on the juice bag. The manufacturers will not honor their guarantee without this code, so be sure to save it for each wine kit, just in case.
How to read the date codes:
Mosti Mondiale - First digit is last digit of year, next 2 are the month and the last 2 is the day. 50807 = August 7, 2015
RJ Spagnols - First 4 digits are the year, next 2 are the month and the last 2 is the day. 20150807 = August 7, 2015
Winexpert - First 2 digits is the batch number. Next 3 represent the number of days into the year. The next 2 is the year and the last 4 is where the kit was in the run.
04 219 15 0252 = August 7, 2015, 4th batch of the day and 252nd kit in the run.
Cellar Craft & Vineco - Ignore the first 5 digits. First digit of the next four is the last digit of the year, while the next 3 represent the number of days into the year. The last grouping of 4 is where the kit was in the run.
03333 5219 0252 = August 7, 2015 and 252nd kit in the run.