Example #1
0
        private static TimeChange GetTimeChangeForLocalTime(List<TimeChange> changes, DateTimeOffset localTime)
        {
            TimeChange timeChange = null;
            var numberOfChanges = changes.Count - 1;
            for (var i = 0; i <= numberOfChanges; i++)
            {
                var change = changes [i];

                // If the old local time was 02:00 and the new local time is 03:00
                // and the user ask for the timezone on 02:30 they will get this exception
                if (localTime.ToMinuteCompare (change.OldLocalTime.DateTime) == 1 &&
                    localTime.ToMinuteCompare (change.NewLocalTime.DateTime) == -1)
                    throw new LocalTimeDoesNotExistException ("The time and date requested falls between the old and new timezone");

                // If the date the user ask for is older (earlier) than the first time change
                var localTimeIsEarlierThanOldLocalTime = localTime.ToMinuteCompare (change.OldLocalTime.DateTime);
                if (localTimeIsEarlierThanOldLocalTime <= 0)
                {
                    timeChange = change;
                    break;
                }

                // If the date the user ask for is newer or the same date as the new local time
                var localTimeIsLaterThanNewLocalTime = localTime.ToMinuteCompare (change.NewLocalTime.DateTime);
                if (localTimeIsLaterThanNewLocalTime >= 0)
                {
                    // If this is the last time change then this is the timechange the user is in
                    if (i == numberOfChanges)
                    {
                        timeChange = change;
                    }
                    else
                    {
                        // If there is more time changes, and the date the user asks for is later than
                        // the next date. Just continue to the next date. If not, 'change' is the
                        // timechange the localTime is in
                        var next = changes [i + 1];
                        if (localTime.ToMinuteCompare (next.NewLocalTime.DateTime) >= 0)
                            continue; // Could be made recursive
                        else
                        {
                            timeChange = change;
                            break;
                        }
                    }
                }
            }

            return timeChange;
        }
Example #2
0
        public TimeSpan GetUTCOffsetFromLocalTime(DateTimeOffset localTime)
        {
            if (TimeChanges == null || (TimeChanges != null && TimeChanges.Count () == 0))
                throw new MissingTimeChangesException ("IncludeTimeChanges either set to false or no time changes for this location");

            var firstNewLocalTime = TimeChanges.FirstOrDefault ().NewLocalTime.Year;
            if (localTime.Year > firstNewLocalTime || localTime.Year < firstNewLocalTime)
                throw new QueriedDateOutOfRangeException ("The year specified in localTime is outside the year available for this location");

            TimeChange change;
            if (TimeChanges.Count () == 1)
                change = TimeChanges.SingleOrDefault ();
            else
                change = GetTimeChangeForLocalTime (TimeChanges.ToList (), localTime);

            TimeSpan span;
            if (localTime.ToMinuteCompare (change.OldLocalTime.DateTime) < 0)
            {
                span = change.OldLocalTime.DateTime - change.UtcTime.DateTime;
            }
            else
            {
                span = TimeSpan.FromSeconds (change.NewTotalOffset);
            }

            return span;
        }