Every day, someone, somewhere tells us that Armageddon's on its way. And it's not just Bible students or self-appointed prophets or celestial signs (such as the recent bloodmoon, supermoons and various eclipses). Even scientists have taken up the cry, most notably, Stephen Hawkins who gives earth 1,000 years before its last pitiful gasp.* Which leaves many people wondering: "Could this signify the End?"
If the prospect has you choking on your coffee, it's worth bearing in mind that, according to Jesus in his great prophecy about the End Times, "no one knows the day or the hour". He did however highlight several signs which would alert us to the nearness of a 'great tribulation' culminating in Armageddon. (Matthew chapter 24)
And, using Bible chronology along with these signs and related prophecies, students have pinpointed 1914 as the beginning of these 'Last Days' which mark the end of the 'Gentile Times' and a catastrophic period in human history. (Revelation 12:9-12)
Other scriptures describing these Last Days and the 'Sign of Christ's presence' include 1 Timothy 3:1-5; Revelation 6:1-8 and Revelation 13:13-16. So if you really want to know the 'whys' and 'hows', get your Bible out or read it online.
As for the 'when'....all we can know with any certainty is that it will be very, very soon, as almost all the prophecies relating to the end have been fulfilled. Endtime prophecies still to happen are:
1) A gathering together of world rulers, headed by the Anglo-American alliance, who will strengthen the UN - to give it 'teeth' as it were. (Rev 16:14; Rev 13: 14-18)
2) A notable cry of 'Peace & security'. (1 Thess 5:3)
3) World powers turning on world religion to its total destruction. (Rev 17:16,17; Rev chapter 18)*, followed by the outbreak of the Great Tribulation mentioned in Matthew 24:21.
*Will Armageddon mean the end of the literal planet? You'll be glad to learn the answer is 'no'. (Psalm 104:5). On the contrary, Revelation 11:18 states that destruction will come to those 'ruining the earth' and that the meek will 'inherit the earth; with the prospect of living forever upon it. (Psalm 37:10,11,29)
Incidentally, the term 'Apocalypse' is another term for 'Revelation' - so it's a revealing of prophecy rather than literal destruction.