The meaning of "AT". HELP
The Company operated 39 clubs at December 31, 2018 throughout the United States. (cited from a contract)
I'm so confused about the meaning of "at" in this sentence. Does it mean
1. At exactly December 31, 2018, the company operated 39 clubs (in one day which is December 31, 2018)
2. From a time in the past to December 31, 2018, the company has operated 39 clubs. Can I use "As of" instead in the second meaning. if it's true.