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, Dec 05 '15 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, Dec 05 '15 at 12:48
If you *don't* have a UTC time, the [round trip (`"o"`) specifier](https://msdn.microsoft.com/en-us/library/az4se3k1(v=vs.110).aspx) will give something like `"2009-06-15T13:45:30.0000000-07:00"` — Wai Ha Lee, Dec 05 '15 at 12:50

Soner Gönül · Answer 1 · 2015-12-05T11:56:35.133

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"));

Converting UTC time to ISO 8601-like format

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