Add Local flag to ToDateTime to easily prevent issues with Summertime/Timezone issues

[blue_meanie]

Please add a Local flag to the ToDateTime conversion function (as already exists on MakeDateTime).

This would be a huge help, to get over the frustrating issues seen during BST (and presumably for installations working across multiple timezones), when you would like to for example, Defer a Work Item to a specific Date Time.

eg: If I want to defer a Work Item to 9am tomorrow, whilst in BST, I have to currently do something long-winded such as break down the desired date into dd MM and YYYY, so I could use MakeDateTime (with the Local flag set to True), or build in a decision stage, to allow subtracting an hour from the time when in BST.