Groovy Script To Read Pattern in a logfile, extract data and do date calculation

def logfile = '''2018-02-26 10:41:21,076 [KilimWorker-4] TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [6] as [VARCHAR] - REFER
2018-02-26 10:41:21,077 [KilimWorker-4] TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [7] as [VARCHAR] - PRE_REFER
2018-02-26 10:41:21,077 [KilimWorker-4] TRACE org.hibernate.type.descriptor.sql.BasicBinder - binding parameter [8] as [TIMESTAMP] - 2018-02-08 23:00:52
2018-02-26 10:41:21,078 [KilimWorker-4] DEBUG com.vedaadvantage.dp3.manager.actor.Message - Audit event Individual_Duplicate_Check_Referred - End
2018-02-26 10:41:21,078 [KilimWorker-4] DEBUG com.vedaadvantage.dp3.manager.actor.DispatcherActor - execute
'''

logfile.eachLine { currentLine, lineNumber ->
    if (currentLine.contains( 'Individual_Duplicate_Check_Referred' )) {
        previousLine = logfile.readLines()[lineNumber - 1]
    }
}

def timeStamp = previousLine.split(' - ').last();
def Date ts = new Date().parse("yyyy-MM-dd HH:mm:ss", timeStamp)
log.info new Date() - ts