Is there something like Shabbath in Islam?

Is there something like Sabbath in Islam? A day when no work is allowed? Jews have that, and observe it quite strictly. Christians have it, but place it on Sunday instead of Saturday. As far as I know, the "holy day" in Islam is on Friday, but I don't know of any restrictions to do work on Fridays. The closest to Sabbath I can think of is Ramadan, but as far as I understand, work is not prohibited as such, only avoided due to the stress imposed by fasting. Is my understanding correct? If not, what am I missing? --- Looks like this is a difficult question, so I try to rephrase it: is there any time or calendar date in Islam where doing work is haram? --- Again, this question has been misunderstood. The question is *not* if Muslims observe Shabbath, whether on Saturday or on Friday or on Sunday. Obviously *NO*. The question was if there is *any concept equal to Shabbath* and the accepted answer is "no, except for the times of obligatory prayers", where work cannot be done because the prayer requires all attention.