Hyoungjun Kim created TAJO-825:
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Summary: Date/Time type refactoring.
Key: TAJO-825
URL: https://issues.apache.org/jira/browse/TAJO-825
Project: Tajo
Issue Type: Improvement
Reporter: Hyoungjun Kim
Currently Tajo uses Joda time library for Date/Time related features.
I tested Joda library with a next test code. It is difficult to express various
time range with Joda library.
So I propose that Tajo uses PostgreSQL style date/time features. I already
migrated PostgreSQL's date/time code to Tajo. I will attach that patch soon.
{code}
Calendar cal = Calendar.getInstance();
cal.set(Calendar.YEAR, 1582);
cal.set(Calendar.MONTH, 9);
cal.set(Calendar.DAY_OF_MONTH, 14);
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
DateTime defaultCalDate = new DateTime(1582, 10, 14, 10, 0, 0, 0);
Chronology julianChrono = JulianChronology.getInstance();
DateTime julianCalDate = new DateTime(1582, 10, 14, 10, 0, 0, 0, julianChrono);
System.out.println("Java Calendar :" + df.format(cal.getTime()));
System.out.println("ISO Calendar : " + defaultCalDate);
System.out.println("Julian Calendar: " + julianCalDate);
System.out.println("ISO Calendar's dayOfWeek: " +
defaultCalDate.getDayOfWeek());
System.out.println("Julian Calendar's dayOfWeek: " +
julianCalDate.getDayOfWeek());
System.out.println("ISO Calendar's getCenturyOfEra: " +
defaultCalDate.getCenturyOfEra());
System.out.println("Julian Calendar's getCenturyOfEra: " +
julianCalDate.getCenturyOfEra());
{code}
{noformat}
Java Calendar :1582-10-24 16:49:35
ISO Calendar : 1582-10-14T10:00:00.000+08:27:52
Julian Calendar: 1582-10-14T10:00:00.000+08:27:52
ISO Calendar's dayOfWeek: 4
Julian Calendar's dayOfWeek: 7
ISO Calendar's getYearOfCentury: 15
Julian Calendar's getYearOfCentury: 16
{noformat}
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