refs https://linear.app/tryghost/issue/CORE-49/fix-errors-in-utils-repo-limit-service
- As I've touched these files did a little refactor and changed where the error messages are stored to keep it up with our lates coding standard - having "messages" hash defined in the module storing all messages that have pottential for i18y in the future.
refs https://github.com/TryGhost/Team/issues/588
- date-fns proved to be unable to manipulate dates consistently in UTC timezone. Keeping all calculations and formatting in UTC is key to have consistency in dates when dealing in inter-system dates
- day.js also failed the test for correct UTC manipulation. See https://github.com/iamkun/dayjs/issues/1271 for example bug which prevents from consistent correct calculation
- luxon was the best option which WORKED. It's also a recommended successor for moment.js with really nice docs and active support
refs https://github.com/TryGhost/Team/issues/588
- There's a need to calculate when the last period has started to be able to generate correct counting queries for the "maxPeriodical" limit
- It operatest on ISO strings as an input and output in UTC timezone to take timezone calculations out of the equation
- Refer to inclucded unit tests for example calculations
refs https://github.com/TryGhost/Team/issues/588
- This is a scaffolding for a new limit type which should allow to check limits based on periods (for example related to billing, subscription cycles)
