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Collections are a way for you to organize kata so that you can create your own training routines. Every collection you create is public and automatically sharable with other warriors. After you have added a few kata to a collection you and others can train on the kata contained within the collection.
Get started now by creating a new collection.
Thanks for the tips, I haven't really done any programming in awhile so I'm quite rusty.
Tip: When using interpolated strings or string.Format, you don't need to format your numbers by calling ToString; you can just pass the format in after a colon in the interpolated placeholder e.g.
Convert.ToInt32($"{year:D4}{month:D2}{day:D2}");.hexNumcould also have been formed with maths rather than string parsing (year*10000 + month*100 +day)