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The v3 API spec for tokens documents the format of timestamps. It says the format is like "CCYY-MM-DDThh:mm:ss±hh:mm". By this, the timestamps returned by keystone like this: 2016-12-13T15:33:12+0000 Change-Id: I616865c1b12457487c4aeb5b8e907ca01cb79ef9 Closes-Bug:#1634568