Best and most efficient way to differentiate and assign types to timestamp tokens

Question

I am working on timestamps parsing. The tokenization of the timestamps is being handled with python using the spacy library. Then I am sending over the tokens from python to Java. What I am trying to do now is to assign each token a 'time type' relating to what is it. A potential date assigned a type 'date', a year as 'year' etc. What I am trying to figure is an efficient way to check each token for what it could be. The challenge is to differentiate a date from a month in short format and a year as well. The basic way I can think of is using multiple checks, but I would need to make deductions to differentiate between dates and months (and year if it is in short format) depending on what the first token is assumed to be. Once I have all the token types and their position index, I can then use them to generate a pattern string using DateTimeFormatter class, so that the timestamp can be parsed and saved to DB. Is there another way to achieve this? I also need to be able to handle timestamps with any possible format like for eg. '20111203'. Appreciate for help!