Saying this as a mantra to yourself is an excellent strategy when there’s nothing else you’re going to do about solving the problem today.
Because worrying about a problem there’s nothing else you’re going to do about today is a waste of time and precious energy.
When I was recently camping in an RV, for example, I discovered the battery died 2-days into a 3-day trip. I knew what I had to do to jump it, knew who I could call if it didn’t work, and checked to make sure I had everything figured out.
Knowing I didn’t want to risk it dying a second time (which would’ve made it a worse and a more limited situation), I decided I didn’t need to jump it that day (I wasn’t going anywhere) and told myself, “That’s a tomorrow problem.”
…And I went back to enjoying the trip.
Another example is when I’m exhausted and faced with work that needs to be done. Is forcing myself to get it done then really necessary or needlessly wasting time and energy in a counterproductive work-state when I could be resting, recharging, and refueling for a fresh attack at the problem the next day?
Don’t confuse this with needless procrastination.
If it can and should be done today, then you can and should do it.
For getting things done is an excellent strategy for eliminating worry about getting those things done—better than putting it off until tomorrow ever is.
The question is: within which realm does this problem fall? And let your time and space dedicated to inner work help illuminate the answer you need to hear.