How do you report hours that vary week to week? - 12 months and counting

I work some days through a staffing agency while still certifying. I do not usually post, so bear with me. Sometimes my paycheck is late by a week. Do you report when you earned it or when you were paid?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.

The claimant handbook has worked examples for part-time pay. Mine was clearer than the phone line.