Vidqun:
Would you say it is all due to coincidence?
Why on earth would I call it ‘coincidence’? Later writers had access to earlier works, and the apocalyptic genre typically shares common themes, of which ‘tribulation’ is the most basic. (Asserting ‘coincidence’ as the only alternative to ‘prophecy’ is also another false dichotomy.)
Approximately 13% of Jesus’ Olivet discourse comprises information about the “great tribulation”
The ‘great tribulation’ in the NT is the destruction of Jerusalem by the Romans in 70 CE. Jesus’ ‘return’ was explicitly expected both after the ‘tribulation’ and within a generation of his death. Earlier OT ‘tribulations’, such as Antiochus’ desecration of the temple and ban of Jewish religion in 168 BCE alluded to in Daniel, do not refer to the same event.