Sunclock is a web based tool for checking local sunrise and sunset times, day length, and twilight phases. It provides city specific results for five reviewed locations, with additional locations available through city search and state browsing. Times are calculated for the selected city’s local date and use a level horizon. The site displays sunrise, sunset, civil dawn, civil dusk, and the interval between sunrise and sunset. It also explains day length and the civil, nautical, and astronomical stages of twilight. Weekly tables and annual curves help users compare daylight across days and seasons, and the site includes guidance on how daylight saving time and seasonal changes affect displayed times. Users can select a city to review its current and upcoming light conditions, then use the information to plan photography, outdoor activities, commutes, or stargazing. City selection and server calculated search results work without JavaScript. Live device time and precise location features require JavaScript, and location shown from an IP address is approximate.