Here is a sample of a CSV format of my data:

Time,TempOut,TempIn,HumOut,HumIn,Baro,Rain,Rate,Wind,WindDir,Gust,GustDir
2020-03-26 10:20:00,56.3,71.8,36.0,31.0,29.742,0.00,-327.68,10.0,270.0,22.0,
2020-03-26 10:30:00,56.8,70.2,35.0,29.0,29.739,0.00,-327.68,12.0,270.0,23.0,
2020-03-26 10:40:00,57.1,69.1,34.0,28.0,29.739,0.00,-327.68,12.0,247.5,22.0,
2020-03-26 10:50:00,57.4,69.0,33.0,27.0,29.742,0.00,-327.68,11.0,247.5,21.0,
2020-03-26 11:00:00,57.5,68.5,33.0,27.0,29.736,0.00,-327.68,13.0,247.5,23.0,

My belief is that this is Local Time.  There is no GMT offset nor timezone 
indicator.  These are the first records that I captured at this particular 
location and I'm pretty sure I started this station around 10 AM and not 3 AM 
local (if the value shown were UTC).  Maybe others could confirm the 
WeatherLink application behavior.  This data came from a Davis Weather Monitor 
II.  I hope this helps.


On Wed, Jan 18, 2023, at 4:19 PM, gjr80 wrote:
> Short answer is it depends. What is the format of the date-time data in 
> your resulting CSV file? Is it straight date and time but in GMT, eg 
> '24-Jan-2023 18:25' or does it have some sort of timezone indicator 
> embedded eg '24-Jan-2023 18:25 GMT' or is an epoch timestamp eg 
> '1674548700'? WeeWX does not recognise timezones but the python 
> datetime calls used may support GMT. I will need to look at your data 
> and the wee_import date-time parsing routines to see what is possible. 
>
> Gary
>
> On Thursday, 19 January 2023 at 08:41:35 UTC+10 Wayne wrote:
>> I am looking into the process for converting my Davis weather archive files 
>> to be imported into weewx. If I'm not mistaken, Davis WeatherLink stores the 
>> timestamps in local time in the .wlk files. Accordingly, the application 
>> wlkReader creates a csv file also in the same local time format. 
>> 
>> The import config file used by the utility wee-import provides an option 
>> raw_datetime_format for defining the text date/time format in the csv input 
>> file. Although I don't see it explicitly discussed in the Utilities Guide, 
>> is there a format code which can be use in this option which applies a UTC 
>> offset conversion to the supplied local time? If so can you give an example 
>> of its usage? Otherwise the only other option I see is to manually convert 
>> the times in the input csv files to UTC prior to importing. I'm sure I am 
>> not the first user to encounter this issue! My thanks in advance. 
>
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