Oaken Barrel: They use a bottling date. From information we have seen the brewer states that If you look at the label on the bottle, there is a notch taken out on the month it was brewed.

Oasis Brewery: clearly shows the bottling date.

Odell: Clearly shows the expiration date. Beer is dated 4 months from bottling.

Odd Side Ales: They use a bottling date which is stamped on the bottle in black ink on the top right portion of the label. Ex: MFG06/0413.

O'Fallon: They use a born on date which is a Julian date stamped on the neck of the bottle. All beers have a 6 month shelf-life except the O'Fallon Gold which is 3 months.

Off Color: They use a bottled on date. Carriers have this date and bottles are slated to have it by the end of Oct. 2013

Offshore Ale: They use both types. From information we have seen the brewer states that on their case cartons they have “Best by” dates stamped on them, their kegs have“Born on” dates on the collar. Their shelf life ranges around 4 months for best flavor. Format is MM/DD/YY.

Old Dominion: They use a bottling date. From information we have seen the brewer states that there should be a date stamp on the 'lower right hand corner' of the bottle. There is a blank space and the date stamp goes right over it.  Once packaged their beer is best enjoyed within 150 days from the bottling date. Format: 03/03/10.

Olde Burnside: They use a bottling date.

Olde Hickory: They use a best by date. From information we have seen the brewer states that it is on the side of the label which has months/years listed and they mark the best by month and year as we bottle.

Olde Mecklenburg: They use a bottling date on all their beers.

Old Schoolhouse: They have dates on their cases only. They use a bottled on date for all their cases except the imperial stout which has a best after date.

Olvalde: No freshness info since most of their beers are cell-arable though they do have the vintage year on them. Will have a bottled on date on very low production bottles.

Omission: They use a bottling date which you can find out more info about any given batch on their website.

Ommegang: They use a Bottling date on their cases they come in and both a bottled on and best by date on their bottles. It's inked in black on the neck of their bottles. The following are the shelf lives of their brands:  Witte – 6 months to 1 year, Rare Vos, Chocolate Indulgence, Ommegeddon, and Biere de Mars – 2 years, Hennepin – 3 years, Abbey Ale and Three Philosophers – 5 years.

OPA-OPA: They use a packed on date which is located on the side of the label.

Oskar Blues: They use a canned date which is located on the bottom of each can. Best consumed by 4 months. Example: Canned with care: 02/28/10 09:56, Slogan.

O'so: They use a bottled date. It's on the bottom of the six-pack.

Otter Creek/Wolaver's: They use a bottling date on the outside of each case and 12 pack and on each bottle near the shoulder slope in yellow ink. From information we have seen the company says their beer is good way past 6 months from bottling date.

Otto's: They use a bottling date which is just on the case.