Taking the system time of the day, starts playing a predefined playlist in the exact second, so that every browser loading the site will see the same content.
//a video
===
//a playlist
[===.===.===.===]
//a day
now
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//fill up the day with playlists
[===.===.===.===][===.===.===.===][===.===.===.===][===.===.===.===]
-----------------------|--------------------------------------------
//determine the video to play for the current time of the day
video
[===.===.===.===][===.<===>.===.===]
------------------------|--------------------------------------------
//calculate the start second of the video
start
[===.===.===.===][===.<=|==>.===.===]
------------------------|--------------------------------------------Demo Playlist: Top 25 Billboard Dance/Electronic