New DateTimeOffset from string

Question

I want to create a new DateTimeOffset with offset = -5 from a string

I do :

string dt = "11082016";    
DateTime date = DateTime.ParseExact(dt, "MMddyyyy", 
                                    CultureInfo.InvariantCulture, 
                                    DateTimeStyles.None);    
DateTimeOffset dto = new DateTimeOffset(date, TimeSpan.FromHours(-5));

Is it possible to create directly a DateTimeOffset without passing by DateTime ?

DateTimeOffset dto = new DateTimeOffset(2016, 11, 8, 0, 0, 0, TimeSpan.FromHours(-5)); — Jim
– Jim, Commented Nov 8, 2016 at 0:36
Can you give any reason of using DateTimeOffset, instead of DateTime, or TimeSpan? — Lei Yang
– Lei Yang, Commented Nov 8, 2016 at 1:34
@LeiYang I need to use this for work with time zone awareness — user7128918
– user7128918, Commented Nov 8, 2016 at 6:02

Matt Johnson-Pint · Accepted Answer · 2016-11-11 01:35:46Z

4

Sure you can:

string dt = "11082016";
string o = "-5";
var dto = DateTimeOffset.ParseExact(dt + o, "MMddyyyyz", CultureInfo.InvariantCulture);

Though it's not very pretty - the point is DateTimeOffset also has a ParseExact method.

answered Nov 11, 2016 at 1:35

Matt Johnson-Pint

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Soner Gönül · Accepted Answer · 2016-11-08 06:49:24Z

Is it possible to create directly a DateTimeOffset without passing by DateTime ?

No, that's not possible.

Every DateTimeOffset instance has to have it's DateTime part. You can't create a DateTimeOffset instance just with a UTC Offset value.

Of course it has some constructors that doesn't take DateTime as a parameter directly like;

DateTimeOffset(Int32, Int32, Int32, Int32, Int32, Int32, Int32, Calendar, TimeSpan)
DateTimeOffset(Int32, Int32, Int32, Int32, Int32, Int32, Int32, TimeSpan)
DateTimeOffset(Int32, Int32, Int32, Int32, Int32, Int32, TimeSpan)
DateTimeOffset(Int64, TimeSpan)

But those Int32 and Int64 values are still generate a Datetime internally for current instance .DateTime property.

I want to create a new DateTimeOffset with offset = -5 from a string

If you could do that, you wouldn't need that string, don't you think?

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