Automated todoist tasks creation

main.cs

void Main()
{
	using var client = new HttpClient();
	client.DefaultRequestHeaders.Add("Authorization", "Bearer <integration_token_here>");

	var dates = new List<DateTime>();
	for (int year = 2020; year <= 2023; year++)
	{
		for (int i = 1; i <= 12; i++)
		{
			for (int j = 1; j <= 7; j++)
			{
				var day = new DateTime(year, i, j);
				if (day.DayOfWeek == DayOfWeek.Thursday && day > DateTime.Now)
				{
					dates.Add(day);
					break;
				}
			}
		}
	}

	// let's make sure we don't want to make more than 50 requests per minut (todoist api limitation)
	Debug.Assert(dates.Count <= 50);

	var months = new string[] {
		"Styczeń", "Luty", "Marzec", "Kwiecień", "Maj", "Czerwiec", "Lipiec", "Sierpień", "Wrzesień", "Październik", "Listopad", "Grudzień"
	};
	foreach (var date in dates)
	{
		// set reminder for 5 hours earlier
		var relativeReminderDate = date.AddHours(-5);

		// this is very important for timezones handling
		var utcReminderDate = relativeReminderDate.ToUniversalTime();

		var taskName = $"Odpady segregowane ({months[date.Month - 1]}/{date.Year})";
		var dateAsRfc3339String = XmlConvert.ToString(utcReminderDate, XmlDateTimeSerializationMode.RoundtripKind);
		var json = JsonSerializer.Serialize(new Task(taskName, <project_id_here>, dateAsRfc3339String));
		var httpContent = new StringContent(json, Encoding.UTF8, "application/json");
		var response = client.PostAsync("https://api.todoist.com/rest/v1/tasks", httpContent).Result;
		response.EnsureSuccessStatusCode();
	}
}

class Task
{
	public Task(string content, uint projectId, string dueDateTime)
	{
		Content = content;
		ProjectId = projectId;
		DueDateTime = dueDateTime;
	}
	[JsonPropertyName("content")]
	public string Content { get; }
	[JsonPropertyName("project_id")]
	public uint ProjectId { get; }
	[JsonPropertyName("due_datetime")]
	public string DueDateTime { get; }
}