This verse means that you will always think of the day when there will be no day, and don’t mistake the day for the time.
According to the official website of the Know Question Bank, this is a fill-in-the-blank question about cherishing time. The type is accumulation over time. Grandma is a hard-working and frugal person. She often warns her children: "There will always be days when you can't think about them, so don't worry about them." There is no time for a time.”
Grandma is an image of a rural woman who is hard-working, frugal, not willing to give up food and clothing, and loves her grandchildren.