validation
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(JS) Validate date in format YYYY-MM-DD
A simple JS function to validate that a date string in the format YYYY-MM-DD is a valid date. Will validate that the day is correct for the given month, including leap years
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(JS) Validate Swedish personnummer and organisationsnummer
JavaScript functions for validating Swedish personal identity numbers (personnummer), and organisation numbers (organisationsnummer). The functions for personal identity number will also validate co-ordination number (samordningsnummer).