Uninstall plugin

Currently there is no automatic uninstall procedure.
As TIMESTAMP fields can be used as a replacement of DATETIME fields (regardless of the possible date range, see: The DATE, DATETIME, and TIMESTAMP Types for MySQL 5.6 ) , you may continue to use TIMESTAMP fields instead of DATETIME fields.

If you really need to revert TIMESTAMP fields to DATETIME fields you may use a backup of the field modifications: this backup is in the table ‘glpi_plugin_timezones_dbbackups’ and contains the complete SQL code needed to revert fields.
You may apply this code to revert your GLPI database to previous state.

But one more time: this revert is not mandatory: you may continue to use TIMESTAMP instead of DATETIME as long as the input dates fit in the TIMESTAMP range.

Sample of contents from this backup table:

	date		table_name		alter_table
	2015-07-02 01:02:40		glpi_alerts		ALTER TABLE `glpi_alerts` MODIFY `date` datetime NOT NULL
	2015-07-02 01:02:40		glpi_authldaps		ALTER TABLE `glpi_authldaps` MODIFY `date_mod` datetime DEFAULT NULL
	2015-07-02 01:02:40		glpi_authmails		ALTER TABLE `glpi_authmails` MODIFY `date_mod` datetime DEFAULT NULL
	2015-07-02 01:02:40		glpi_budgets		ALTER TABLE `glpi_budgets` MODIFY `date_mod` datetime DEFAULT NULL
	2015-07-02 01:02:40		glpi_calendars		ALTER TABLE `glpi_calendars` MODIFY `date_mod` datetime DEFAULT NULL
	..		..		..