Question: I convert from UTC to Julian Date. But I need to convert Julian Date to UTC. I researched but I didn't find any code in c#

I did `UTC to Julian Date`
I need `Julian Date to UTC`

Answer: 
Create this extension method:

```
public static class DoubleExtensions
{
    public static DateTime JulianDateToUtc(this double julianDate)
    {
        var sinceEpoch = julianDate - 2440587.500000D;

        return new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Utc).AddDays(sinceEpoch);
    }
}

```

Then you can just do:

```
2458324.500000D.JulianDateToUtc();

```
You can use the [NodaTime](https://nodatime.org/2.2.x/userguide/calendars) library `FromJulianDayNumber` method to do the conversion to an instant from which you can get UTC, it will handle all of the minutia that the accepted answer does not handle.