Getting data from two tables that are not exact matches

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MySQL

I need to produce a load analysis report on my ticketing system. It is driven by day.

On any given day I can have Validations and credit journeys, validations alone or credit journeys alone.

If I drive by Validations I can use a left join to pick up any days that have credit journeys and to all practical purposes that is the real world probability.

However I would like to expand my query to also cover the possibility that a day might see credit journeys but no validations!

The tables are on a MySQL database and the data will take the form

T1-----T2
---  ---
A-----
B-----B
-----C
D-----
E-----E

I have looked at Union but I don't think its correct.

Any thoughts?