Microsoft has just announced support for .NET Core 1.0 and .NET Core 1.1 will end on the 27th June. The three-year support began with the release of .NET Core 1.0 in the summer of 2016 and version 1.1 fits within this framework.
Now is the time to take the steps to upgrade to .NET Core 2.1 or .NET core 2.2 to avoid any last-minute scramble this summer. .NET Core 2.1 and .NET Core 2.2 differ in the support provided. .NET Core 2.1 has long-term support whereas .NET Core 2.0 is on a ‘current release’ system.