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Issue number: Internal --------- <!-- Please do not submit updates to dependencies unless it fixes an issue. --> <!-- Please try to limit your pull request to one type (bugfix, feature, etc). Submit multiple pull requests if needed. --> ## What is the current behavior? <!-- Please describe the current behavior that you are modifying. --> The Datetime header, Datetime time button, and Datetime Button have default date formatting that cannot be set by the developer. ## What is the new behavior? <!-- Please describe the behavior or changes that are being added by this PR. --> - The developer can customize the date and time formatting for the Datetime header and time button - The developer can customize the date and time formatting for the Datetime Button - A warning will appear in the console if they try to provide a time zone (the time zone will not get used) - A warning will be logged if they do not include the date or time object for formatOptions as needed for the presentation of the Datetime ## Does this introduce a breaking change? - [ ] Yes - [x] No <!-- If this introduces a breaking change: 1. Describe the impact and migration path for existing applications below. 2. Update the BREAKING.md file with the breaking change. 3. Add "BREAKING CHANGE: [...]" to the commit description when merging. See https://github.com/ionic-team/ionic-framework/blob/main/.github/CONTRIBUTING.md#footer for more information. --> ## Other information <!-- Any other information that is important to this PR such as screenshots of how the component looks before and after the change. --> These changes have been reviewed in #29009 and #29059. This PR just adds them to the feature branch now that the separate tickets are complete. --------- Co-authored-by: ionitron <hi@ionicframework.com> Co-authored-by: Liam DeBeasi <liamdebeasi@users.noreply.github.com>