The month is sourced, but the exact day is not. These events are not attributed to a specific day.
LoRaWAN specification 1.0 is dated January 2015. It describes a network protocol built on LoRa radio technology.
Source: https://lora-alliance.org/wp-content/uploads/2020/11/2015_-_lorawan_specification_1r0_611_1.pdf
ID: lorawan-10-spec-month