Counting time on a job.

Hi

Please could some help me? I am trying to create a sheet for staff who can time themshelf how long they have been on a particular job.

I have 2 sheet.

On 1st sheet (is main menu which is visable all time on the screen)

Cell B2 has formula =Now() displaying date(13/07/2101) & time(10:40) & Am/PM
Cell B7 staff will scan there ID bar code (once scanned it will move to cell B13)
Cell B13 Satff will scan JOB ID & then press enter.

On 2nd sheet
Column A = Employee ID (when the the user scan the ID from manin menu)
Column B = Date (from main menu pasted as value)
Column C = Job ID (when user scan the job ID)
Column D = Start Time (time started the job from system)
Column E = End Time (when next job is scanned it put end time on previous job)
Column F = Total Minutes (diffrence between start time and end time)

Please see the attached file.

I have put example

Please can some help i am a staff who is try to help my fellow friend out as day in day out we all get in trouble for our time on job.

If anyone has similier file please could you send it to me.