I don't think we will know for sure when the abomination of desolation is standing in the place it ought naught, because that is something easily faked or misinterpreted
This is from around 2013
you can stand an evil man in the temple whenever and it's hard to say if it is THE event.
For me, I won't be sure the tribulation is kicking off until:
The first angel sounded, and there followed hail and fire mingled with blood, and they were cast upon the earth: and the third part of trees was burnt up, and all green grass was burnt up.
~ Revelation 8:7
When it's raining blood and I look out my window and drive around in my car and ALL the green grass is burnt up, then I'll know for sure things have kicked off and I'll look back for the abomination. Until then I'll take man's prophecies with a grain of salt.