I recently uploaded some Purple Air SD card data for a monitor that was not connected to wifi. The timestamps look off. Purple Air’s description of the DateTime column indicates that the timestamps will be in UTC time, but the timestamps appear to be in local time. The first and last timestamps on the file line up with, respectively, the local time when I first plugged in, and when I unplugged the monitor (not accounting for daylight savings, though). They are the correct date and time, just not in UTC. The internal clock seems to be working fine, and this monitor gets regularly connected to wifi. What am I to make of this and how should I treat the data in this column in order to move forward? Screenshots below:
