What is the apt way to comment on salesforce version. For example Salesforce has released SPRING 15, but I see the API Version as 33.0
What is SPRING 15 exactly termed?
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Spring'15 is the friendly name for less technical human beings.
There are usually 3 releases per year: spring, summer and winter. The year is incremented at the winter release, so what we get in late 2015 will become winter'16
33.0 is the API version typically incremented by 1 each release, so Summer'15 will end up with 34.0
Both names can be used to address a release.
There is even a third internal version number you might hear in serious and tricky support cases. It was somthing like 188.0 the last time I had to deal with it. As far as I know, you can't see this number in Salesforce or in the documentation, so I was a bit puzzled first. But under the hood, this seems to be the real version.
The versions supported on your pod can be accessed by the API at https://<pod>.salesforce.com/services/data/ i.e. https://cs17.salesforce.com/services/data/
This will return a list of all the supported API versions, along with their 'friendly' name:
<?xml version="1.0" encoding="UTF-8"?> <Versions> <Version> <label>Winter '11</label> <url>/services/data/v20.0</url> <version>20.0</version> </Version> ... <Version> <label>Spring '15</label> <url>/services/data/v33.0</url> <version>33.0</version> </Version> </Versions>
You can also view the exact point release that is installed on a pod at https://success.salesforce.com/issues_releases_view?release=194000000 - this will show you the bugs fixed in a release, along with the exact versions installed on each pod down the right-hand side.