Strange result for idoc job

Question

dear experts,
i encountered a strange issue about job please see the below detail.
thirst for your help. thanks very much.
background: These is a Z program which is used to generate IDOC using MASTER_IDOC_DISTRIBUTE.
                      (the idoc is used to send billing invoice info.)
                      The program also will write a result report.
                      The Job has two step: 1.call the Z program with a variant. 2.call program RSEOUT00 to delivery idoc.
The issue:     In the job spool list it show all the invoice that sent successfully.
                      In the idoc we have one field like V_TYPE.
                      The job is ok for 2 years and recently the strange stage occur, because there will be several idoc generate,
                      but in the first IDOC for every JOB, the value of V_TYPE was fix to one value (for example 'F')
                      (as the  program  logic the vaule is set wrongly.)
                      It first occured in March, and some days later it was recover automatically, but recently it occurred again,
                      about 15 days, but till now it recover again from yesterday....
So, could you provide some clew? I think it's not relevant with the program logic.

Answer 1

It's a bug in your code.
mm is not the month. mm is the minute... which you already know since you use it elsewhere.
Try the pattern of
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");