I found the solution!!!
The tiddler [[First day tasks]] has the content I want to show the first
day of each month.
With this code we show the content of the tiddler [[First day tasks]] only
if today has the value 1. Else, it shows "no tasks".
<$set name="today" value=<<now DD>>>
<$set name="one" value="1">
<$list filter="[<today>match<one>]" emptyMessage="no tasks">
[[First day tasks]]
<$wikify name="texto" text={{First day tasks}} output="html">
<<texto>>
</$wikify>
</$list>
</$set>
</$set>
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