Camp Slaughter

Camp Slaughter also known as Camp Daze is a 2005 science fiction horror film written and directed by Alex Pucci, and cowritten by Draven Gonzales.

In the morning, the travelers are found by campers and counselors from Hiawatha, and invited to stay at the camp, which looks like it has not changed since the 1980s. As the quartet is shown around noticing how anachronistic the place is someone murders any campers who go off on their own. That night, the killer rampages through the facilities, butchering everyone except the quartet. At dawn, the travelers awaken to discover that nothing appears to be wrong, and that everyone is alive again.Daniel and Ivan, a pair of counselors who are aware of what is going on, find the four, and explain that the camp is in a time loop, stuck repeating the day of the killing spree. To prove they are telling the truth, the counselors take the others to witness the first murder, a strangulation in the woods, which they have never been able to stop, despite their best efforts. The timedisplaced four try to leave on their own, but the SUV will not appear until nightfall, and walking away just brings them back to Hiawatha. Daniel and Ivan state that they are limited in what they can do, but with the help of outsiders, they may be able to break the loop, and move on to whatever fate awaits them. ........

Source: Wikipedia