Multiple Sensor Calibration, Internal Clock Errors

I have been doing a calibration for four sensors to ensure they are all provide the same reading for the same air quality. One of the sensors is collecting data at what seems to be a slower rate than the other sensors and has less data points for the same amount of time. Is there any way to calibrate the internal clock so that all of my sensors take measurements at the same speed? Any help or advice would be greatly appreciated.