Seconds from now to seven o'clock.

I need to know current time UTC and how many seconds there is to 7:00 pm (or 19:00) So I need this because I have to know how many seconds away to send notification. Let’s say that current time UTC is 6:30 pm and player open my app and that register that send notification after 1800 seconds.

Well, @Tap1 you would get DateTime.(Now, Etc) and increase it. Example 7h (*times) 60m = 420 (*times) 60 (capturing the seconds) 25, 200 Alternatively go to google and type in hours to seconds and a thing will pop up that will help you convert it.

EDIT: TRY THIS CODE. @Tap1
using System;

namespace ConsoleApp1
{
class Program
{
static void Main(string args)
{
TimeSpan TillSeven;
DateTime date = new DateTime(2017, 7, 31, 7, 00, 0);
TillSeven = DateTime.UtcNow - date;
Console.WriteLine(TillSeven.Hours * 60 * 60); //4 hour * 60 = 240 Minutes * 60 = 14,400 Seconds.
Console.ReadKey();
}
}
}