A page can have several dates that mean different things. When reviewing material from read the Agent9w homepage, separate the date it was published from the date you personally read it.
If an updated date is displayed, record that label exactly. Do not assume it means every paragraph changed. In your notes, use separate fields for Published, Updated and Checked by me. Leave a field empty when the information is not shown rather than estimating it.
Apply the same approach when saving master-agent details on Agent9w. A checked-on date helps explain when your reference was observed, while the source’s own date describes its publication history. Keeping both prevents a personal review date from being mistaken for a website update.