Date of The Book of Psalms

Date - 1056 BC Approximately. It is impossible to determine exactly how the Psalms were compiled and collected, and dating them is also difficult for most of the Psalms. Some of the Psalms are commemorating victories, while others are historical, remembering the Lord and God's people in past events. Other Psalms are prophetic and look to the future and the coming of the Messiah, as well as the heavenly kingdom. There are Psalms of affliction, lamentation and remorse over sin, as well as songs of Thanksgiving and trusting the Lord. Some of the songs were chosen to be good for reciting on certain Jewish holy days, like the Sabbath, or Passover, the feast of Tabernacles, etc. There are titles on about 100 of the Psalms, the titles are so old that they cannot be understood even in the second century BC. Some of the titles point to the source of the Psalm, while others point to a certain purpose, or a certain melody, or something related to music.

Link: https://bible-history.com/old-testament/bookofpsalms