timezone for publish date in blog post create?

for the $core_v2_blogpost.create call, there is a parameter called PublishDate which take in a DateTime format. As we didn't give it the time zone, what's the default timezone that the api considering, is it server time?

Because right now there is a issue with time conversion, when I publish I try to put the publish date as in server time. But for some reason the publish date showing in the blogpost object after creation is the user time. Does this behavior expected or I missed something in the code may cause this issue?



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[edited by: davidyu888 at 6:24 PM (GMT 0) on Wed, Oct 20 2021]