getDate(TimeZone tz)
{
/*
** Ingres dates are overloaded with 'empty' date,
** date only, timestamp and interval values. The
** first three types are handled explicitly below.
** Intervals will either cause an exception while
** attempting to parse the value or as the default
** action for an unrecognized format.
*/
try
{
if (value.Length == 0) // Empty date
{
/*
** Ingres permits zero length date literals or 'empty'
** dates. Since does not have any corresponding
** date/time concept, we use the date epoch. If
** no timezone is provided, we can return the local
** epoch constant. Otherwise, the epoch value for the
** requested timezone must be generated.
*/
return((tz == null) ? SqlDates.getEpochDate()
: SqlDates.parseDate(SqlDates.D_EPOCH, tz));
}
else if (value.Length == SqlDates.D_FMT.Length) // Date only
{
/*
** The date is stored in GMT such as to have a 0 time for
** the target TZ (requested/local).
*/
return((tz == null) ? SqlDates.parseDate(value, false)
: SqlDates.parseDate(value, tz));
}
else if (value.Length == SqlDates.TS_FMT.Length) // Timestamp
{
/*
** Remove the time component but retain correct date:
**
** 1. Convert to GMT Timestamp using TZ for current connection.
** 2. Format as date only using local TZ to get local date.
** 3. Generate Date value using requested/local timezone.
*/
DateTime date = SqlDates.parseTimestamp(value, use_gmt);
String str = SqlDates.formatDate(date, false);
return((osql_dates && tz != null)
? SqlDates.parseDate(str, tz)
: SqlDates.parseDate(str, false));
}
else // Interval
{
/*
** Can't support intervals with Date objects.
*/
throw SqlEx.get(ERR_GC401B_INVALID_DATE);
}
}
catch (SqlEx ex)
{
/*
** Any parsing error is assumed to be caused by an interval.
*/
interval = true;
throw ex;
}
} // getDate
