$CloudVersion
gives the version of the currently connected cloud server.
Examples
Basic Examples (1)
Wolfram Research (2018), $CloudVersion, Wolfram Language function, https://reference.wolfram.com/language/ref/$CloudVersion.html.
Text
Wolfram Research (2018), $CloudVersion, Wolfram Language function, https://reference.wolfram.com/language/ref/$CloudVersion.html.
CMS
Wolfram Language. 2018. "$CloudVersion." Wolfram Language & System Documentation Center. Wolfram Research. https://reference.wolfram.com/language/ref/$CloudVersion.html.
APA
Wolfram Language. (2018). $CloudVersion. Wolfram Language & System Documentation Center. Retrieved from https://reference.wolfram.com/language/ref/$CloudVersion.html