Hardcode UTC DateTime value (12:00 midnight, January 1, 1601 A.D. (C.E.), UTC) in C#

Question

I have a UTC DateTime value: 12:00 midnight, January 1, 1601 A.D. (C.E.), UTC

How would I hardcode this UTC DateTime value in C#

if (job.DateTimeValue == <UTC value>)

Answer 1

The DateTime type has a constructor that allows you to set:

• Year
• Month
• Day
• Hour
• Minute
• Second
• Millisecond
• DateTimeKind (UTC, Local, Unspecified)

---

var jobMinDateValue = new DateTime(1601, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);

if (job.DateTimeValue == jobMinDateValue)
{
    // ...
}

---

12:00 midnight, January 1, 1601 A.D. (C.E.), UTC happens to be a special date & time on Windows... Windows represents FileTime as the number of 100-nanosecond intervals that have elapsed since 12:00 midnight, January 1, 1601 A.D. (C.E.) Coordinated Universal Time (UTC).

That means that in FileTime terms the value 0 means 12:00 midnight, January 1, 1601 A.D. (C.E.), UTC

That gives you another alternative to get the same value you're looking for:

var jobMinDateValue = DateTime.FromFileTimeUtc(0);

if (job.DateTimeValue == jobMinDateValue)
{
    // ...
}