How to calculate night time using date time?

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Hey Codeproject,

I've already figured out that there's 86400 seconds in a day, and I'd like to make a color more black towards the 86400 mark.

So, I started by doing the following:

C#

// pseudo code
// Color * 0f = Completely Transparent
// BackgroundColor = Color
Color.Black * (1f / 86400f * DateTime.TotalSeconds)

The problem is though, the moment it hits midnight, the total seconds will be reset to 0, since a new day started. It's still night thought at that point.

Does anyone have an idea on how to fix this?

Best Regards,
- 11841791

What I have tried:

C#

// pseudo code
// Color * 0f = Completely Transparent
// BackgroundColor = Color
Color.Black * (1f / 86400f * DateTime.TotalSeconds)

Posted 13-Jul-16 6:39am

Member 11841791

Updated 13-Jul-16 7:02am

v4

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Patrice T · Accepted Answer · 2016-07-13T07:02:00

Solution 1

Rather than using the number of seconds since midnight.
Use the number of seconds around (before or after) 12 o clock.

abs((86400/2)-DateTime.TotalSeconds)

[Update]
Pay attention to the fact that the maximum result of my formula is 43200.

Posted 13-Jul-16 7:02am

Patrice T

Updated 13-Jul-16 7:59am

v2

Comments

Member 11841791 13-Jul-16 13:45pm

Color.Black * ((1f / 86400f) * (float)Math.Abs((86400f / 2f) - World.DateTime.Second))

Is the working fully version! Thanks a lot!