// period_command
public static Value PeriodCommand(CallScope args)
{
string arg = CallScope.JoinArgs(args);
if (String.IsNullOrEmpty(arg))
{
throw new LogicError(LogicError.ErrorMessageUsagePeriodText);
}
Report report = args.FindScope <Report>();
StringBuilder sb = new StringBuilder();
sb.AppendLine(TimesCommon.Current.ShowPeriodTokens(arg));
DateInterval interval = new DateInterval(arg);
sb.AppendLine(interval.Dump());
report.OutputStream.Write(sb.ToString());
return(Value.Empty);
}