Looking at charts provided by http://catchawhale.com/ you can see visually the best time to Post your content, and if you reading this soon after I've posted this, now is not the time.
Quote from http://catchawhale.com/ -
Potential chance of currently catching a whale is low to mid level (The Whales could be close by but currently rarely seen.)
In fact, now is generally the worst time!! Here are charts from the past 2 days with GMT as the time scale...
The best time to post your content appears to be 6pm (GMT). This is because, with the payout cycle now being 12hrs, this gives you the longest period of time, with high levels of 'Whale' activity.
By all means, your content can still get noticed anytime of day, but posting around 6pm onwards gives you the best possible chance of being noticed by a user with lots of voting power, and many other users...
In addition to the above, looking at the top trending list, the closest article to have been posted to 'now' (time) is 6 hours ago...