[Qgis-user] date expressions, symbology, current date

[Alexandre Neto]

Hello Tim,

You can use rule-based renderer for creating your 3 categories.

https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/vector_properties.html#rule-based-renderer

As for the rules of each category, take a look at the now() function that
will retrieve the current date and time, and age() function that will allow
you to calculate the difference between two dates and cast it as months.

https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/functions_list.html#now
https://docs.qgis.org/3.16/en/docs/user_manual/working_with_vector/functions_list.html#age

Alexandre Neto
User support
www.qcooperative.net


tim dunlevie <tim.dunlevie5 at gmail.com> escreveu no dia terça, 18/01/2022
à(s) 00:50:

> Hi guys,
>
> I am trying to symbolise a map based on a date field ('YYYY-MM-DD') versus
> Current_Date
>
> I want to colour polygons based on these categories:
> - day / month within 3 months of CURRENT_DATE (today).
> - day / month within 6 months of CURRENT_DATE
> - day / month within 9 months of CURRENT_DATE
>
> any ideas?
>
> thanks,
> Tim
> _______________________________________________
> Qgis-user mailing list
> Qgis-user at lists.osgeo.org
> List info: https://lists.osgeo.org/mailman/listinfo/qgis-user
> Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20220118/b80ccee6/attachment.html>