Did he meant Sunday or Monday?

At 12:57 am a guy I'm seeing sent me a text. I was asleep, but I don't know if I woke up because my phone went off or I was waking up and just happen to hear my phone. Anyways we talk about spending the day together. He had went to visit his family in a different county, from where we both currently live. He said he was going to drive back and get me at around noon or 1. I said ok. Now after our conversation I look at the time. He technically said "all day tomorrow." He has not shown up or replied to my messages. Since it was 12:57 am when the conversation started it was already technically Sunday, but I get that it can still feel like Saturday. But since I haven't heard from him I'm wondering if his tomorrow meant Monday and not Sunday (today). I also thought he meant Sunday because I assume he has to work Monday and I have to work Monday. I know technically it's the last week the company will be open and I really don't have much to do, but I still have to show up. I feel like an idiot asking this, but do you think he meant Sunday or Monday?