Date formatting in D

[aberba via Digitalmars-d-learn]

I've been trying to figure out an inbuilt functionality in phobos 
for formatting date. In my use case, I've been trying to format 
current Unix timestamp to something like "Thu, 08 Mar 2017 
12:00:00 GMT".

How do I go by this easily (Currently, long concatenation of 
strings is what I'm thinking)?

I saw this thread[1] from 2011 on similar issue. Has it been 
resolved? What is the state of toCustomString?

[1] 
http://forum.dlang.org/post/mailman.673.1320367887.24802.digitalmars-d-learn@puremagic.com