private OffsetDateTime CreateUpdatedOffsetDateTimeFromTokens(OffsetDateTime existingOffsetDateTime, DateToken dateToken, TimeToken timeToken)
{
var existingLocalDateTime = existingOffsetDateTime.LocalDateTime;
var day = existingLocalDateTime.Day;
var month = existingLocalDateTime.Month;
var year = existingLocalDateTime.Year;
if (dateToken != null)
{
if (dateToken.Day.HasValue) day = dateToken.Day.Value;
if (dateToken.Month.HasValue) month = dateToken.Month.Value;
if (dateToken.Year.HasValue) year = dateToken.Year.Value;
}
var hour = 12;
var minute = 0;
if (timeToken != null)
{
hour = timeToken.Hour;
if (timeToken.Meridiem == Meridiem.AM && hour == 12) hour = 0;
if (timeToken.Meridiem == Meridiem.PM && hour < 12) hour += 12;
minute = timeToken.Minute ?? 0;
}
try
{
return new LocalDateTime(year, month, day, hour, minute).WithOffset(existingOffsetDateTime.Offset);
}
catch (ArgumentOutOfRangeException)
{
throw new InvalidTokenValueException(ErrorMessages.InvalidDateTime);
}
}
private Answer GetAnswerToTimeConversionQuestion(Question question, DateToken knownDateToken, TimeToken knownTimeToken, CityOrTimezoneToken knownCityOrTimezone, CityOrTimezoneToken unknownCityOrTimezone)
{
var knownEntityOffsetDateTime = CreateUpdatedOffsetDateTimeFromTokens(knownCityOrTimezone.GetCurrentTimeAsOffsetDateTime(), knownDateToken, knownTimeToken);
Instant knownCityOrTimezoneInstant;
String note = null;
if (knownCityOrTimezone.GetType() == typeof(CityToken))
{
var cityToken = (CityToken)knownCityOrTimezone;
ZoneLocalMapping knownCityOrTimezoneZoneLocalMapping = DateTimeZoneProviders.Tzdb[cityToken.City.Timezone].MapLocal(knownEntityOffsetDateTime.LocalDateTime);
if (knownCityOrTimezoneZoneLocalMapping.Count == 1)
{
knownCityOrTimezoneInstant = knownCityOrTimezoneZoneLocalMapping.Single().ToInstant();
}
else if (knownCityOrTimezoneZoneLocalMapping.Count > 1)
{
knownCityOrTimezoneInstant = knownCityOrTimezoneZoneLocalMapping.First().ToInstant();
note = String.Format("In {0} the time {1} occurs twice due to daylight saving time changes when clocks are put back, we are using the first occurance of that time.",
cityToken.City.FormattedName,
knownEntityOffsetDateTime.LocalDateTime.GetFormattedTimeAndDate());
}
else
{
knownCityOrTimezoneInstant = knownCityOrTimezoneZoneLocalMapping.LateInterval.Start.WithOffset(knownCityOrTimezoneZoneLocalMapping.LateInterval.WallOffset).ToInstant();
note = String.Format("In {0} the time {1} does not occur due to daylight saving time changes when clocks are put forward, we are using the next valid time.",
cityToken.City.FormattedName,
knownEntityOffsetDateTime.LocalDateTime.GetFormattedTimeAndDate());
}
}
else if (knownCityOrTimezone.GetType() == typeof(TimezoneToken))
{
var timezoneToken = (TimezoneToken)knownCityOrTimezone;
knownCityOrTimezoneInstant = knownEntityOffsetDateTime.LocalDateTime.WithOffset(timezoneToken.Timezone.Offset).ToInstant();
}
else
{
throw new NotImplementedException();
}
var answerText = String.Format("It is {0} in {1} when it is {2} in {3}",
unknownCityOrTimezone.GetLocalDateTime(knownCityOrTimezoneInstant).GetFormattedTimeAndDate(),
unknownCityOrTimezone.GetFormattedNameAndTimezone(knownCityOrTimezoneInstant),
knownEntityOffsetDateTime.LocalDateTime.GetFormattedTimeAndDate(),
knownCityOrTimezone.GetFormattedNameAndTimezone(knownEntityOffsetDateTime.ToInstant()));
var answer = new Answer(question, true, true, answerText);
answer.Note = note;
return answer;
}