# diff Compares the log events found in your requested time period with the log events from a previous time period of equal length. This way, you can look for trends and find whether specific log events are new. Add a modifier to the `diff` command to specify the time period that you want to compare with: + `diff` compares the log events in the currently selected time range to the log events of the immediately preceding time range. + `diff previousDay` compares the log events in the currently selected time range to the log events from the same time the preceding day. + `diff previousWeek` compares the log events in the currently selected time range to the log events from the same time the preceding week. + `diff previousMonth` compares the log events in the currently selected time range to the log events from the same time the preceding month. For more information, see [Compare (diff) with previous time ranges](CWL_AnalyzeLogData_Compare.md).