I efiled on 1/17/2020 however my date of transmission changed from the 17th to 1/27/2020. Why is that?

[ee-ea]

See this   https://www.irs.gov/newsroom/irs-opens-2020-filing-season-for-individual-filers-on-jan-27

[lcartwright01]

This is because 1/27 is the first day that the IRS is accepting returns.  If you notice, it should say transmitted.