Hi & welcome! Are your plants potted or in the ground? Do your plants look happy, or a little wilted and dry? Are you able to add a pic? Are they in the same spot as always, same amount of sun & such? Are you looking for blooms in the morning? That's the only time my plants have open blooms.
I'm requesting to move this discussion to purslane/Portulaca forum, since there is a great one here.