WHEN WILL THE 7 YR. TRIBULATION BEGIN?

When will the GREAT TRIBULATION begin? Where are we on the Biblical Calender? What time is it?.
{Published: May 22, 2021 - El Shadai Ministries / Pator mark Biltz}
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1Thessalonians 5:1-5
Now concerning the times and the seasons, brothers, you have no need to have anything written to you. For you yourselves are fully aware that the day of the Lord will come like a thief in the night. While people are saying, There is peace and security, then sudden destruction will come upon them as labor pains come upon a pregnant woman, and they will not escape. But you are not in darkness, brothers, for that day to surprise you like a thief. For you are all children of light, children of the day. We are not of the night or of the darkness.

Genesis 1:14,15
And God said, Let there be lights in the expanse of the heavens to separate the day from the night. And let them be for signs and for seasons, and for days and years, and let them be lights in the expanse of the heavens to give light upon the earth. And it was so.