Sorry, my bad. What prophecies are you referring to? In what way does biblical prophecy mandate that the end times are now, as opposed to the many other times and dates which were supposed to be the end in the past? In my life, I have surpassed several dates that many evangelicals thought would be the end. My grandfather used to laugh at me because I was so sure that the end was near, because in the 1930s everyone was sure that prophecy would be fulfilled then, but it didn’t happen. I just remain a skeptic that this is the end. If it happens, hallelujah. But I’m not holding my breath.
It isn't as easy as pointing to a few verses... anyone who would expect that does not know prophecy, or the nature of prophecy. I could give you incidental verses which point toward what I see, but they are incidental, and therefore unconvincing.
The seventh trumpet is an important time - The Revelation plainly states that the whole of the Prophecy is completed at that point - a very critical distinction, as it necessitates the salvation of the Jews (all at once) by that moment, which means that the salvation of the Jews MUST have taken place before the Rapture...
Tracking backward from that point, one can calculate the things which must yet happen - as ALL of the Prophecy is completed and revealed there.
What needfully MUST take place is that Israel must be established as a nation. This one has already occurred, and is a huge mile marker. the binding of Ephraim and Judah into one (nationally, if not spiritually), the building of the Temple (or at least the opening of the Eastern Gate, and the establishment of the Altar), and the War of Magog (which is separate from Armageddon). These are all precursors necessary for the beast to sit in the Temple, and for Christ to enter into the Temple.
But I look to Prophetic chronology for determination. While there are not "dispensations", there are "times" described in the Bible, and those times are finite and exact.
Among the long calculations, one should look closely at the Jubilee and grand Jubilee, and what they are meant to represent. This is the long calendar - plotting the length of times from the Creation.
The rest require a person to believe that God's Word is ALWAYS true - and that his promises to the twelve tribes continue to hold value (God's Word does not return to Him empty). And furthermore, that the Prophecy is evident to every generation - He has stated that this is His proof that He IS God. In that regard, the Prophecy has been ticking along, steady as a clock, and evident to those who will SEEK it, and believe.
The other chronologies are part and parcel with the TWO Houses of Israel, and are embedded in God's Holy Days. The promises toward all the tribes, and the ten northern tribes (the House of Israel) especially, must necessarily have taken place by now. Ephraim (The House of Israel) was the key for me. Rightly dividing Ephraim from Judah in both the prophecies and in history is paramount to any understanding at all.
There is a pretty specific chronology concerning the return of Ephraim to the House of the Lord. There is a finite and specific end to the "Time of the Gentiles." There is a precise chronology for the return of Israel as a state, and the time that Jerusalem is rebuilt (under Israel).
Major long calculations converge on a grand Jubilee year between 2037 and 2060. That is of course, the outside edge, as the time is to be "cut short". The Prophecy is the proof.