Here is a script to identify when was the database taken offline/online and few other information like login name, host name and application name.

Script

DECLARE  @DBNAME nvarchar(100)
  ,@FileName nvarchar(max)
  ,@Status nvarchar(10)
  
SET @DBNAME = NULL -- Provide [DBNAME]
SET @Status = 'OFFLINE' --Provide [OFFLINE / ONLINE]
SELECT @FileName=[path] FROM sys.traces WHERE is_default=1

DECLARE @ErrorLogTable table (Logdate datetime, ProcessInfo nvarchar(10), [Text] nvarchar(max))

INSERT INTO @ErrorLogTable
EXEC xp_readerrorlog 0,1, @Status, @DBNAME, NULL, NULL, 'desc'

SELECT Distinct DatabaseID, DatabaseName, HostName, ApplicationName, LoginName, StartTime, B.ProcessInfo, B.Text
FROM sys.fn_trace_gettable( @FileName, DEFAULT ) A
Inner join @ErrorLogTable B on A.SPID = cast(SUBSTRING(B.ProcessInfo,5,5) AS int)
and CAST(StartTime AS nvarchar)=cast(B.Logdate AS nvarchar) 

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