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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.
Description does not explain what kind of aspects related to calendar should be considered, and how.
Some days can be longer or shorter than the others, there are days which are 25 hours long, or 23 hours long, or a second longer or shorter.