public string GetFrontMonth(DateTime date, bool useExpiryRatherThanRoll = false)
{
var d = date.AddMonths(-_settings.RollGen.MonthModifier);
var trialMonth = s_futureMonths[d.Month - 1];
var trialYear = d.Year > YearBeforeWhich2DigitDatesAreUsed?DateExtensions.SingleDigitYear(d.Year) : DateExtensions.DoubleDigitYear(d.Year);
var trialCodeString = $"{Prefix}{trialMonth}{trialYear}";
var trialCode = new FutureCode(trialCodeString, YearBeforeWhich2DigitDatesAreUsed, _futureSettingsProvider);
trialCodeString = trialCode.GetPreviousCode();
trialCode = new FutureCode(trialCodeString, YearBeforeWhich2DigitDatesAreUsed, _futureSettingsProvider);
trialCodeString = trialCode.GetNextCode(false);
trialCode = new FutureCode(trialCodeString, YearBeforeWhich2DigitDatesAreUsed, _futureSettingsProvider);
var testDate = useExpiryRatherThanRoll ? trialCode.GetExpiry() : trialCode.GetRollDate();
if (testDate < date)
{
trialCodeString = trialCode.GetNextCode(false);
}
return(trialCodeString);
}
public static DateTime GetExpiryFromCode(string code, IFutureSettingsProvider futureSettingsProvider)
{
var c = new FutureCode(code, DateTime.Today.Year - 2, futureSettingsProvider);
return(c.GetExpiry());
}