Wrong hours online cost you twice. A customer who drives over and finds you closed blames you, not Google — and a customer who sees "closed" while you're standing there open just goes somewhere else, and you never know it happened. When I checked this county's restaurants, one downtown spot's own website said closed on a day the listing sites said open. Same day, two answers. That customer isn't gambling on it.
Here's the fix, start to finish, from your phone.
Step 1: find out who controls your listing
Search your business name on Google. If the panel on the right shows "Own this business?", nobody's claimed it — tap that and follow the steps (it's free; Google usually verifies you with a phone call, a text, or occasionally a postcard to the shop). If somebody claimed it years ago — an old employee, a marketing company you stopped using — Google has a request process to take ownership back, and it works; it just takes a few days.
Step 2: fix the regular hours
Once you're in, search your business name again and Google shows you edit buttons right in the search results. Set every day, including the ones you're closed — a blank Tuesday reads as "who knows" to a customer, not as "closed Tuesday."
Step 3: set holiday hours before the holiday
There's a separate spot for special hours — Labor Day, Thanksgiving, the day after Christmas when everybody guesses. Google nags customers with "hours might differ" warnings on holidays unless you've confirmed them. Thirty seconds per holiday, and you look like the one business in town that has it together.
Step 4: make your website agree
Whatever the listing says, your own site has to say the same thing, or you've built the contradiction yourself. If updating your site means calling somebody and waiting a week, that's a different problem — and worth fixing too.
Step 5: the listings you never made
Yelp, the yellow-pages sites, the little directories — many created a page for you years ago without asking. You don't have to chase all of them. Fix Google first (it's most of the traffic), then claim the ones customers actually mention. If a directory shows an old address or a dead number and won't let you fix it easily, most have a "suggest an edit" that works eventually.
None of this is exciting. It's also some of the cheapest money in local business — every bit of it is free, and the customer who finds accurate hours at 8pm on a Sunday is the one standing in your shop Monday morning.