Why someone can stay in jail with not charge and without date to release him

Sorry to hear about this. If he is not a US Citizen then they could hold him so they can contact immigration (ICE) with the hope that they will deport him.  Usually, they can only hold them for about a week or so before they release them. But if they have a warrant or something from another county, then they could keep them longer. Your friend's situation sounds like a difficult one. Unfortunately, if your friend is not a U.S. citizen it is possible that they could hold him until they can contact Immigration and he may face deportation. Depending on the specifics of his case, there may be other repercussions as well such as having to pay fines or serving jail time in addition to being deported. The best thing you can do right now is to contact an immigration attorney who specializes in cases like this and get them involved in finding out what options are available for your friend and how best to move forward with his case. You might also want to reach out to any local legal aid services or clinics that provide pro bono representation since these services are often free of charge or have low fees depending on the specifics of your financial situation. Finally, speaking from personal experience I know that contacting local state representatives can sometimes help when facing situations like this so consider doing that if all else fails as well!