formatDate function can be used in your case.https://experienceleague.adobe.com/en/docs/journey-optimizer/using/content-management/personalization/functions/dates#format-date 

Conditions on timeSeriesEvents will not work.

Events from internal Journey Optimizer datasets (Message Feedback, Email Tracking, etc.) cannot be used to trigger a journey.  Audience based approach would be preferred in this approach. https://experienceleague.adobe.com/en/docs/journey-optimizer/using/configuration/configure-journeys/events-journ...

One of the options to explore is Business rule where a daily frequency cap can be requested https://experienceleague.adobe.com/en/docs/journey-optimizer/using/configuration/frequency-rules#daily-frequency-cap Also, take note of the below callout. 

You can take a look at this documentation for examples https://experienceleague.adobe.com/en/docs/journey-optimizer/using/content-management/personalization/functions/functions#string-functions  

No, there isn't a function currently to do this. Is the value dynamic ? Do you have any examples of the nature of data that needs to be reversed

You can take a look at the following example in the documentation https://experienceleague.adobe.com/en/docs/journey-optimizer/using/orchestrate-journeys/building-advanced-conditions-journeys/syntax/collection-management-functions #{ExperiencePlatform.ExperienceEventFieldGroup.experienceevent.all(cu...

Kindly log a support ticket for this issue.

If you want to activate this data more like a batch kind of a use case, you can either explore computed attributes functionality https://experienceleague.adobe.com/en/docs/experience-platform/profile/computed-attributes/overview or data distiller https://experienceleague.adobe.com/en/docs/experience...

Kindly take a look at this documentation https://experienceleague.adobe.com/en/docs/journey-optimizer/using/orchestrate-journeys/about-journey-building/update-profiles#using-the-profile-update on update profile node. You should ideally be able to select the schema, dataset (if you have created one) ...