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== Introduction ==
The files '''today.ini''' and '''yesterday.ini''' are used by Cumulus to store the Highs and Lows (and their timestamps) for key parameters as reached on each of the two days. These files are normally located in the Data sub-folder of the path where your Cumulus.exe is installed. See [[FAQ#I_can.E2.80.99t_find_my_data_files.21| FAQ on location of data log files]] for where else to look.
The today file is written to throughout the current day as any new High or Low for the day at reached. At the end of a day [either midnight, or 9am (or 10am) depending on your configuration and season], the today.ini file is rolled-over to become yesterday.ini and a new today.ini is created. From the examples below you can see that the two files have a few differences in content, so rolling-over does involve a little editing work.▼
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If you close down and restart Cumulus during the day it will read these files at startup, so it can resume tracking extremes of the key parameters.
== Dealing with rogue values ==
Normally you would not need to edit these files, however rarely you may wish to [[FAQ#My_station_invented_some_rain_that_didn.27t_really_occur.2C_and_I_want_to_set_it_to_zero_.28or_some_other_figure.29 | edit the rain data]] if there has been a quirk in your weather station reporting during the day and the figure is abnormally inflated. '''Note:''' If you do edit either of these files, you must close Cumulus down first! The files are text files, so edit using any plain text editor. The format consists of a number of sections (section title is delimited by []), and a number of properties (consisting of attrbute name, an equals sign and a value). Blank lines canbe included for readability, they are ignored. All values have to be specified in the correct format, see example below.▼
The today file is written to throughout the current day as any new High or Low for the day at reached. If your weather station reports a rogue value, an incorrect update to the High or Low may result, but details of that update should be in the [[Diags]], so look there to see what correction will be required to eliminate the rogue value. Normally you would not need to edit today.ini, however rarely you may wish to [[FAQ#My_station_invented_some_rain_that_didn.27t_really_occur.2C_and_I_want_to_set_it_to_zero_.28or_some_other_figure.29 | edit the rain data]] if there has been a quirk in your weather station reporting during the day and the figure is abnormally inflated. The stored rainfall today value in today.ini may be edited within Cumulus via ''Today's rain'' screen on the '''Edit''' menu. This does not affect any false derived rainfall values for the month or year. '''Note:''' If you do decide to edit today.ini outside Cumulus, you must close Cumulus down first!
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==Example today.ini file==
<pre>
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