Allow memo date change Firefox

[RoccoSmit]

in v 0.22.4 the ability to update memo dates was reinstated. This feature works in Edge and Chrome but not Firefox

This is due to Firefox needing a specific date string format provided as the input value otherwise the time section of the datetime is not populated.

This becomes an issue as Firefox only fires the change event needed to update the date state if the complete date and time is set on the input

This pr is to provide the required date string format of yyyy-mm-ddThh:mm:ss

Tested in Firefox and Chromium and works as expected.