What the dates mean
- Last published is the last time the pipeline found a difference from AWS and shipped new data to the site. The pipeline checks every AWS price list daily and publishes only when something has moved, so a quiet week leaves this date alone.
- Data last changed is the last time that service's published data changed: a rate, a region, a SKU, or a fix to how we process the price list. A newer price list with the same rows doesn't move it.
- AWS price list published is the publication date AWS stamps on the offer file the data was built from. AWS republishes these often without changing a price, so this date is usually the newer of the two.
- Google catalog fetched is when the Google Cloud Billing Catalog was last read. Google doesn't date its catalog, so this is our fetch time, not a price list date, and it moves with every fetch whether or not a price changed. Data last changed is the date to trust for Google Cloud.
AWS prices come from the public AWS price lists and Google Cloud prices from Google's Cloud Billing Catalog; the methodology covers which offers and what's excluded. Providers can change a price between refreshes, so confirm with the AWS Pricing Calculator or Google's pricing calculator before you commit.