How to find the end of support dates for z Systems operating system releases
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You can use the IBM Support Portal to get information about General Availability (GA) and End of Support / Service (eos) dates for the operating systems z/OS, z/VM, z/TPF and z/VSE per release, product id and policy type.
The dates are on the "Support Lifecycle" page - here.
For z/VSE the GA and end of support dates are on the "z/VSE Status" web page too - here.