This clock is set for the end of Rosh Hashanah (September 22nd) in 2028. This may or may not be the day or time of the upcoming Rapture (it might be much sooner). Want to know more about potential dates? 
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When Will Jesus Return?

While I can't know the EXACT day or hour (Mark 13:32) of the return of Jesus Christ, this countdown clock is set for the Feast of Trumpets, which is the time period when Christ will be "right at the door."
The Feast of Trumpets (AKA Rosh Hashanah) is an annual Holy Day known to the Jews literally as the feast that "no man knows the day or the hour" because it can't be confirmed to begin until two witnesses in Jerusalem see the first sliver of the new moon. Perhaps Jesus was telling us more than we read into it today. 
Seek God's truth for yourself and find out more!