No Dawn or Dusk in Scenario Book?

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This scenario, South of Kharkiv, was also in the original Panzergrenadier.  In the scenario it says "First Turn: 0500 Day."  The scenario in East Front merely says, "First Turn: 0500."  Neither scenario book gives the time for Dusk/Dawn so I assume that such are a 4th Edition thing and will go with "Day" for the play of the scenario.

Factually right, or wrong; scenarios were either "Day" or "Night" or included a specific instruction to the contrary back then. Eastern Front Deluxe was actually a 2nd edition module if you consider the rules first published with it as its "home" ruleset, although 3rd wasn't too far behind it's release. Things were less chromey in those times.