Day night Meter reading

I moved to bulb last month, yesterday I wanted to submit my meter reasing , I realized that the day and night meter readings are swapped. With my previous supplier I use to submitt meter reading using Reading 1 and Reading 2 . But with bulb it says Day and Night so I wasnt sure which one is day and which one is night. So I tested it yesterday so I thin kmy meter readings are swapped. Please let me know what to do.