fix : error message in crete event date section

[maze-runnar]

Start date & time should be before End date and time

Fixes #3568

Short description of what this resolves:

previously message was showing "Start date & time should be after End date and time" so i chage it to Start date & time should be before End date and time .

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

[maze-runnar]

@kushthedude please review this .