Haggai 2:20 is a later oracle (24th day, 9th month) compared to 2:1 (21st day, 7th month), continuing the sequential prophecies.

Haggai 1:1 dates the very first prophecy (1st day, 6th month) earlier than 2:1, forming a chronological series.

Haggai 1:15 dates the earlier oracle (24th day, 6th month), establishing the timeline leading up to the prophecy in 2:1.

Zechariah 1:1 dates his first prophecy one month after this verse, showing their contemporary ministries.