How do we know we are in the last time according to the Bible?

According to 1 John 2:18, the presence of many Antichrists is a definitive sign that we are in the last time. John writes that these Antichrists have come from within the church, demonstrating that they were never truly part of it. Their rejection of core truths about Christ signifies a broader apostasy that aligns with prophetic warnings found throughout Scripture. This situation prompts believers to remain grounded in the Gospel and safeguard their faith against the currents of false beliefs that may arise in the last times.