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I don't think so that there is any specific time to post on steemit.
Since this platform is used all over the world and one can upvote any time before expiry of 7 days. So the post remains available for the whole community for 7 days.
In my point of view if your post has the quality content then it will attract the audience automatically.
However, there is a possibility that if you are posting for a certain community then by following time zone of that community may earn some extra visibility.

The best time can be determined from post testing.
That is to say, you should post at different times of the day for possibly one week then you can see which posts gets the most engagement.
Note the time of the day you made such post, that should give you an idea of best time to post

Sometime around 6-9 pm GMT. Steemit is more active around this time.

A lot of whales come around during the late evening/night time.

I don't think there's a best time to post on steemit.. Every country has a different time zone and while some in one post of the world are asleep some are actually awake

There is no "best time" to post. Once you are ready to post then that is as good of a time as any. "Publish or perish" as the saying goes.

If you really need a time backed by a logical reason my guess would be after 5 p.m. PST because that is when steemfollower.com resets its votes limit for the next 24 hours so curators can upvote another 10 posts.

It depends on your audience. If you write in Mandarin and your audience is primarily from that region, around middle of the day there would be the best time to post. Writing in English, 12:00 PM-9:00 PM US Central is probably around the best time to post.

Also, weekends. You want to post on those, since that's when a lot of people are off work and blogging/browsing Steemit.

I think there is no time to post on steemit. At any time you can post on steemit. If you want to told what is the time for post on steemit and get more than I want to tell you that in this fact there is no specific time to post on steemit and get more upovote. If your make quality content then whenever you post on steemit this is not fact. If you will make quality content and if there is anyone who love your content then I think he or she will upvote you.

At last, I think that there is no specific time to post on steemit and I think every moment is best for posting on steemit.