For Jeppesen:
- issue date is when they come out of print-shop, based on their internal business processes. It is once a week I believe on Friday. Might differ between Denver and Frankfurt (or where else).
- effective date: regulated AIRAC cycle time base, that's when the newly published information becomes valid. Set by the relevant ANSP / CAA.
For small and irrelevant changes, Jepp decides i.a.w. their (audited) production and quality assurance systems what to change, when and how. As a customer, you can choose how frequently they will ship the updated charts: immediately, or bi-two weekly. Those are non-critical changes. Yes: one company (such as the CAA inspector
) may run on a weekly rotation and have charts in hand that have not been yet posted to your employer!
For AIRAC mandated changes with the EFFECTIVE date, of course, they need to be printed in advance (hence the issue date 2 weeks sooner on your example) to allow for the logistics all the way into pilot's clip. Interestingly, electronic delivery has identical challenges. Even in an EFB, the information is not complete without checking the CCNs.
That being said, back to your question: Why is there an EFF date on a chart that has "No Changes" ? - see above. Human factors (not) swapping pages where only the reverse has changed.