export abstract class NglDateAdapterBase { /**
     * Converts a user supplied string to a `Date` object based on the supplied `format`.
     * If conversion is invalid, it returns `null`.
     */ abstract parse ( value , format ) ; /**
     * Converts a `Date` object to the desired `format`.
     */ abstract format ( date , format ) ; /**
     * Converts a pre-defined name or custom format to well valid date pattern.
     */ abstract pattern ( name , delimiter ? ) ; }