Please help. I just completed self learning fundamentals and already have a task I want to try, first post here so please be gentle :-). I have two files containing job run details for two different jobs over 3 months. it also contains a julian date format from the mainframe but the event data is very similar. The jobs have a relationship in that on a particular day job_a(file1) is a prerequisite to job_b(file 2). in pseudo : I  want to calculate the difference between the time job_a started and the time job_b started for each day. Assumptions confirmed  : job_a is always earlier then job_b difference in hh:mm.  So this is the regex I used to convert the julian to gregorian while importing each of the files so I could use the event data as my _time and date in the index : timestamp format regex = %y%j%H.%M.%S.%N timestamp prefix regex = [A-Z][A-Z]\d\d\s\d\d Here is the sample records in each file : Delimited by space : fileds = Julian_date time jobname jobnr FILE1 : 2 sample records :  2021056 00.30.06.05 JOB_A 2021055 01.30.10.43 JOB_A FILE2 : 2 sample records :  2021056 03.30.23.50 JOB_B 2021055 02.00.10.43 JOB_B the output I would like to achieve is  :              DATE                  JOB_A_START       JOB_B_START        START_TIME_DIFF 2021-02-24                                 00H30                       03H30                                03H00 2021-02-23                                 01H30                       02H00                               00H30 I would really appreciate the approach thinking as well (i.e. why steps are done) because I found myself questioning even how I would approach the index and source and source-types because I ended up just coding a lot of SPL trying to get to something that looks like it will work(Eventually ended up deleting the index). I was very comfortable dealing each file individually creating graphs etc... but the minute the second one came in and I needed it as a "joint" output plus comparing the date fields and subtracting it in the event data etc..etc.. I realized I was now more confused than with a single file... I think if I can get the thought process of an experienced person it will really help(this is something I miss due to trying self learning 🙂 ).  I hope the above is clearly articulated. Again, thanks in advance. ... View more