Reading makes a full man, conference a ready man, and writing an exact man / Francis Bacon
You want to transform your system from one state to another. The initial state is when DateTime is used everywhere. The target state is when DateTimeOffset is used everywhere. You want to do it smoothly
If you find some of these things in your application you should double check if your application works correctly with dates and times: Usages of non-UTC aligned date and time Usages of GETDATE() in SQL with
The list of all time zones present on PC (Windows 10 Home). This is what you’ll get with the operation TimeZoneInfo.GetSystemTimeZones() in C#.