C#•2mo ago

RFC3339 to DateTime

Title says it, I can't find anything online for RFC3339 to Datetime, only the reverse

18 Replies

Angius•2mo ago

Isn't RFC3339 just spicy ISO-8601? If so, then DateTime.Parse() will handle it If that doesn't work, DateTime.ParseExact()

Unknown User•2mo ago

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phantomlord127•2mo ago

Just out of curiosity: why DateTimeOffset?

Unknown User•2mo ago

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MODiX•2mo ago

$datetimelie

please please please get into the habit of using DateTimeOffset instead of DateTime in your code everywhere you possibly can. DateTimeOffset contains the UTC offset with the data so is lossless. DateTime is very very weird in how it stores data. DateTime only knows UTC and "local" time. But your local time zone can change! Laptops easily move across state lines, even while an app is currently running. (So you are in California running an app, put some DateTime instance in memory, hop on a plane to New York, then resume your app 3 time zones ahead. What on earth will be contained within the DateTime instance?) But wait, this was a lie. DateTime actually has 3 ways it keeps track of time: UTC, local (which can change while an app is running), and unspecified (unknown, essentially). (Unknown = I don't know if it's UTC or local, the app will figure it out later and call ToUniversal or ToLocal before calling ToString or any comparison routine.) But wait, this was a lie. DateTime actually has a secret fourth way of storing data that's not exposed in the standard API surface! It's truly an abomination of a type. All of this nonsense is irrelevant if we just pretend DateTime doesn't exist and we instead use DateTimeOffset everywhere.

- GrabYourPitchforks (start: https://discord.com/channels/143867839282020352/143867839282020352/988353756108312607)

Unknown User•2mo ago

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phantomlord127•2mo ago

Thank you for the info. Didn't know that

Unknown User•2mo ago

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phantomlord127•2mo ago

You mean my timezone? It's UTC + 2

Unknown User•2mo ago

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Core•2mo ago

Sorry, but what if I'm using DateTime everywhere because I'm only working with UTC Is that still a bad thing?

Unknown User•2mo ago

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MODiX•2mo ago

TeBeCo

using System;

var rstTimeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
var localTime = new TimeOnly(13, 30, 0);

Console.WriteLine(GetFormatedFutureLocatedDateTime(new DateOnly(2023, 01, 28), localTime , rstTimeZoneInfo ));
Console.WriteLine(GetFormatedFutureLocatedDateTime(new DateOnly(2023, 03, 28), localTime , rstTimeZoneInfo ));

string GetFormatedFutureLocatedDateTime(DateOnly localDate, TimeOnly localTime, TimeZoneInfo rstTimeZoneInfo)
{
  var unknownDateTime = localDate.ToDateTime(localTime);
  
  var rstOffset = rstTimeZoneInfo.GetUtcOffset(unknownDateTime);
  var targetDateTimeOffset = new DateTimeOffset(unknownDateTime, rstOffset);

  return targetDateTimeOffset.ToString("yyyy-MM-ddTHH:mm:ddK");
}

using System;

var rstTimeZoneInfo = TimeZoneInfo.FindSystemTimeZoneById("Romance Standard Time");
var localTime = new TimeOnly(13, 30, 0);

Console.WriteLine(GetFormatedFutureLocatedDateTime(new DateOnly(2023, 01, 28), localTime , rstTimeZoneInfo ));
Console.WriteLine(GetFormatedFutureLocatedDateTime(new DateOnly(2023, 03, 28), localTime , rstTimeZoneInfo ));

string GetFormatedFutureLocatedDateTime(DateOnly localDate, TimeOnly localTime, TimeZoneInfo rstTimeZoneInfo)
{
  var unknownDateTime = localDate.ToDateTime(localTime);
  
  var rstOffset = rstTimeZoneInfo.GetUtcOffset(unknownDateTime);
  var targetDateTimeOffset = new DateTimeOffset(unknownDateTime, rstOffset);

  return targetDateTimeOffset.ToString("yyyy-MM-ddTHH:mm:ddK");
}

2023-01-28T13:30:28+01:00
2023-03-28T13:30:28+02:00
                     ^

2023-01-28T13:30:28+01:00
2023-03-28T13:30:28+02:00
                     ^

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Unknown User•2mo ago

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Core•2mo ago

Yes, that is right

phantomlord127•2mo ago

I think currently it's a format for me. I didn't know about Datimeoffset or the RFC Document.

Unknown User•2mo ago

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MODiX•2mo ago

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RFC3339 to DateTime