January 21, 2019[nb 1] is the 21st day in the month of January 2019.
- 23:28 UTC-2: In Shayeris, Aquaman talks with Wyynde about Dolphin's recovery in Atlantis and is informed by Oracle of Nightwing and Black Lightning's disappearance at Granny Goodness' house. Wyynde insists on investigating with Aquaman.
- 20:30 EST: Malcolm Duncan talks with Karen Beecher while driving through Ivy Town about him getting tested for the Meta-Gene, revealing that he tested negative. They then discuss their unborn child before Karen suddenly goes into labor.
- 17:32 PST: At the Hub, Victor Stone says goodbye to his father after deciding to stay. Geo-Force and an injured Beast Boy return from a battle with Condiment King.
- Series producer Greg Weisman stated that even though the series does not have a "canon year", the production team based the days of the week on the 2010 calendar. In "Happy New Year" there's a five year time jump and in "Princes All" there's a two year jump, making the current year 2018. (Weisman, Greg (2011-11-18). Question #13695. Ask Greg. Retrieved 2011-11-18.).