Hi depends on the archive interval you are using, the IP logger can store 
2560 archive records. So at a five minute archive interval that is 12800 
minutes = 213 hours 20 minutes = 8 days 21 hours 20 minutes. It's 7 April 
today so if you are using five minutes you may have lost 29 March and a bit 
of 30  March. If you are using > five minutes you are fine, less than five 
minutes, sorry, too bad they are gone.

Either way I would immediately stop WeeWX and then using wee_device I would 
dump the logger memory using wee_device --dump 
<http://weewx.com/docs/hardware.htm#vantage_dumping_the_logger_memory>. 
This will dump all archive records in the logger memory to the WeeWX 
database, you will likely see many duplicate primary key errors in the log, 
they are just records that have been dumped but are already in your archive 
and can be ignored. Anything that is in the logger and not in your archive 
will be saved. Once --dump is finished rebuild your daily summaries and 
delete your March 2021 and April 2021 NOAA reports and they should be 
regenerated on the first report cycle when you restart WeeWX.

Gary

On Wednesday, 7 April 2021 at 20:45:53 UTC+10 david_h wrote:

> I had a problem due to Daylight Saving Time, which I have resolved in the 
> sense that my station is running fine now and recording data etc.  My 
> weather website is www.ashteadweather.com.  However, it has left me with 
> 3 days of no data in my NOAA reports for 29 March to 31 March 2021 
> inclusive, and hence incorrect "Record" data as this period coincided with 
> the warmest day of the year so far in my location.   I have a Davis Vantage 
> Pro2 with IP Datalogger.  Everything is fine from 1 April onwards, which is 
> when I managed to correct the DST issue.  Does anyone have any ideas as to 
> how I can look for the missing data?  Will it be in my datalogger, or is it 
> lost forever?  Thanks.  David.

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