Exposing Enums on Web API

EnumController.cs

public enum Day 
{
  Sunday = 0,
  Monday = 1,
  Tuesday = 2,
  Wednesday = 3,
  Thursday = 4,
  Friday = 5,
  Saturday = 6
}

public enum Month 
{
  January = 1,
  February = 2,
  March = 3,
  April = 4,
  May = 5,
  June = 6,
  July = 7,
  August = 8,
  September = 9,
  October = 10,
  November = 11,
  December = 12
}

[HttpGet("Days")]
public IActionResult GetDays()
{
  return Ok(GetEnum(typeof(Day)));
}

[HttpGet("Months")]
public IActionResult GetMonths() 
{
  return Ok(GetEnum(typeof(Month)));
}

private IEnumerable<(string key, int value)> GetEnum(Type enumType)
{
    return Enum.GetValues(enumType)
      .Cast<int>()
      .Select(e => (Enum.GetName(enumType, e), e));
}