Converting UTC time to ISO 8601-like format

Question

I would like to convert a UTC time to to the following format (IS0 8601). Eg.

2000-01-01T17:00:00-05:00

Currently I'm using UtcNow.Convert.ToString("s"), which gives me the datetime in the format

2015-12-05T08:49:14

but this skips the time part after the "-" symbol.

Can anybody help on this ?

Is - between your time part and offset part means just - separator or it represents negative offset? — Soner Gönül
– Soner Gönül, Commented Dec 5, 2015 at 10:54
You say you have a UTC time but you want it to display a UTC offset, which by definition is zero. — Wai Ha Lee
– Wai Ha Lee, Commented Dec 5, 2015 at 12:48
If you don't have a UTC time, the round trip ("o") specifier will give something like "2009-06-15T13:45:30.0000000-07:00" — Wai Ha Lee
– Wai Ha Lee, Commented Dec 5, 2015 at 12:50

Soner Gönül · Accepted Answer · 2015-12-05 11:56:35Z

3

I think your format is little bit different than ISO 8601 format.

First of all, when you use any z format specifier, you always get + or - sign depends on your UTC Offset value is negative or positive.

Would be better to get your current local time zone utc offset, format it with hh\\:mm format and combine your formatted UtcNow value like;

var utcOffset = TimeZoneInfo.Local.GetUtcOffset(DateTime.UtcNow);
var formattedOffset = utcOffset.ToString("hh\\:mm");
Console.WriteLine(DateTime.UtcNow.ToString("yyyy-MM-ddTHH:mm:ss'-'" + formattedOffset));

Or you can use The "s" standard format specifier and format your offset part with - string literal as;

Console.WriteLine(DateTime.UtcNow.ToString("s") + utcOffset.ToString("'-'hh\\:mm"));

edited Dec 5, 2015 at 11:56

answered Dec 5, 2015 at 11:43

Soner Gönül

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