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Editorial Team
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Asked: 2026-05-12T22:24:56+00:00

I assume this should be pretty simple, but could not get it :(. In

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I assume this should be pretty simple, but could not get it :(.
In this format Z is time zone.

T is long time pattern

How could I get a date in this format except by using 

DateTime dt = DateTime.Now;
Console.WriteLine(dt.ToString("yyyy-MM-ddTHH:mm:ssZ"));

in C#

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1 Answer

  1. Editorial Team

    Using UTC

    ISO 8601 (MSDN datetime formats)

    Console.WriteLine(DateTime.UtcNow.ToString("s") + "Z");

    2009-11-13T10:39:35Z

    The Z is there because

    If the time is in UTC, add a ‘Z’
    directly after the time without a
    space. ‘Z’ is the zone designator for
    the zero UTC offset. “09:30 UTC” is
    therefore represented as “09:30Z” or
    “0930Z”. “14:45:15 UTC” would be
    “14:45:15Z” or “144515Z”.

    If you want to include an offset

    int hours = TimeZoneInfo.Local.BaseUtcOffset.Hours;
string offset = string.Format("{0}{1}",((hours >0)? "+" :""),hours.ToString("00"));
string isoformat = DateTime.Now.ToString("s") + offset;
Console.WriteLine(isoformat);

    Two things to note: + or – is needed after the time but obviously + doesn’t show on positive numbers. According to wikipedia the offset can be in +hh format or +hh:mm. I’ve kept to just hours.

    As far as I know, RFC1123 (HTTP date, the “u” formatter) isn’t meant to give time zone offsets. All times are intended to be GMT/UTC.

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