Chargify Activity Log
On the Activity tab on a Subscription, the dates show as "about 4 hours ago" etc.
If you hover the mouse over that label, the the actual date and time will pop up in a tooltip.
In FireFox?, right-click anywhere and 'inspect element', then switch to the console tab and paste it in at the bottom after >>. (You may have to 'allow pasting' the first time to confirm you know what you're doing.)
In Chrome Tools -> Web Developer -> Web Console and paste the code at the bottom after the >> prompt.
Thanks to [@mdepolli] for this tip.