Get rid of deprecated API usage:
authorChristian Weiske <cweiske@cweiske.de>
Sun, 7 Oct 2018 09:44:54 +0000 (11:44 +0200)
committerChristian Weiske <cweiske@cweiske.de>
Sun, 7 Oct 2018 09:44:54 +0000 (11:44 +0200)
- \OC_User
- \OCP\User
- \OCP\Util::formatDate

Resolves: https://github.com/cweiske/grauphel/issues/69


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