Earlier in 2017, a bug was fixed whereby the overnight data being retrieved from a Davis datalogger was recorded with today’s date (rather than yesterdays) (MySQL data different when extracted from datalogger - BUG BEHAVIOUR IDENTIFIED - #11 by steerage250 - Archived Weather Display Problems 2016-2017 - Weather-Watch.com).
- it’s not quite fixed !
The data from the evening of 31/12/2017, was recorded as 31/12/2018 !
(You don’t get many opportunities to test this one :D)