Can I fast today for Shivratri?

Hey everyone! For me, Shivratri started on the night of the 26th and goes through the 27th for Puja. I was going to fast on the 26th, but I had an overnight shift and felt like I was going to pass out. I’m going to fast instead today, the 27th, until the 28th morning while praying since I don’t have work today. Is this okay?