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According to Wikipedia, the Apollo 11 splashdown occurred at July 24, 1969, 16:50:35 UTC.
I'm looking for reference(s) I can cite.
A search for apollo 11 timeline site:history.nasa.gov yields a handy reference for both times. The final TV broadcast was 22:45 to 23:04 UTC on the 23rd.
The timeline is part of the larger "Apollo By The Numbers" statistical reference, which is a great place to find lots of trivial data about the missions.
Looking at the Apollo 11 Lunar Surface Journal
There are some slightly different times for splash down:
195:18:18 Swim 1: Splashdown! Apollo has splashdown. According to the Apollo 11 Mission Report, the moment of splashdown is given as 195:18:35. However, PAO will give an unofficial time of 195:18:21 GET.
(Public Affairs Officer (PAO) Jack King) ( 195:18:35 means 195 hours, 18 minutes and 35 seconds after liftoff)
Figure 13-1 depicts the U.S.S. Hornet and associated aircraft positions at the time of command module landing at 195:18:35
(16:50 G.m.t. ). The command module landed at a point calculated by recovery forces to be latitude 13°19 ' N and longitude 169°9 ' W
The spacecraft re-entered the atmosphere at 400,000 feet at 12:35 P.M. EOT, and 13 minutes later splashed into the Pacific Ocean approximately 825 nm southwest of Hawaii.
Adding 13 minutes to 12:35 P.M. EOT is 12:48 EOT or 16:48 UTC.
Figure 13-1 depicts the Hornet and associated aircraft positions at the time of caamand module landing at 195:18:35 (1650 G.m.t.). The command module landed at a point calculated by recovery forces to be 13 degrees 19 minutes north latitude and 169 degrees 9 minutes west longitude .
The entry phase was normal, and the command module landed in the Pacific Ocean at 195-l/4 hours .
195-l/4 hours or 195:15 would be 16:15 UTC
After an automatic entry sequence and landing system deployment, the command module landed in the Pacific Ocean at 195-l/2 hours.
Three different times within the same Apollo 11 Mission Report.
In this report, all actual times are given as elapsed time from range zero (g.e.t.), which is established as the integral second before lift-off. Range zero for this mission was 13:32:00 G.m.t., July 16, 1969.
Adding 195:18:18 mission time to 13:32:00 lift-off time is 16:50:18 UTC, but we got also 16:50:21 and 16:50:35.
