The time of sunrise and sunset is very dependent on the precise location and the date in question. Please re-post your question with the date and the city name or ZIP code. If you add the WikiAnswers category "Sunset Times", I'll see it.
You can calculate the time of sunrise and sunset easily by visiting the United States Naval Observatory web site's Sunrise & Sunset calculator. You will need the date, city and state for US locations, or the date, latitude, longitude and time zone for any other locations in the world.
The site is
http://www.usno.navy.mil/USNO/astronomical-applications/data-services/rs-one-day
You can also calculate the times of sunrise and sunset for one year at a given location at the site:
http://www.usno.navy.mil/USNO/astronomical-applications/data-services/rs-one-year
On October 16, 2010, in New York City, sunrise will be at 7:07 Eastern Daylight Time, and sunset will be at 6:15 PM EDT.
On 16 Oct 2010, sunset at Greenville was at 6:54 PM EDT.
The sun sets at 6:16 pm in Destin, Florida on October 15, 2010.
at 6:11 PM EEST
It was at 7:00 PM EDT.
It was at 6:16 PM MDT.
at 6:21 PM PDT
Sunset would be at 7:03 PM EDT.(Local sunset time is more than an hour after the sunset times for the Atlantic coast, on the eastern edge of the same time zone. For example, Augusta, Maine in the same time zone has a sunset at 5:53 PM EDT)
6:14pm http://www.sunrisesunset.com/custom_srss_calendar.asp
at 6:46 PM MDT
Sunset at Lexington KY on 16 Oct is around 6:59 PM EDT (22:59 UTC).
If the Chula Vista you are refering to is the one near San Diego, then 6:14pm.