UDate object
* and a set of integer fields such as UCAL_YEAR, UCAL_MONTH,
* UCAL_DAY, UCAL_HOUR, and so on.
* (A UDate object represents a specific instant in
* time with millisecond precision. See UDate
* for information about the UDate .)
*
*
* Types of UCalendar interpret a UDate
* according to the rules of a specific calendar system. The U_STABLE
* provides the enum UCalendarType with UCAL_TRADITIONAL and
* UCAL_GREGORIAN.
*
* Like other locale-sensitive C API, calendar API provides a
* function, ucal_open(), which returns a pointer to
* UCalendar whose time fields have been initialized
* with the current date and time. We need to specify the type of
* calendar to be opened and the timezoneId.
* \htmlonly
\endhtmlonly
*
* \code
* UCalendar *caldef;
* UChar *tzId;
* UErrorCode status;
* tzId=(UChar*)malloc(sizeof(UChar) * (strlen("PST") +1) );
* u_uastrcpy(tzId, "PST");
* caldef=ucal_open(tzID, u_strlen(tzID), NULL, UCAL_TRADITIONAL, &status);
* \endcode
*
* \htmlonly\endhtmlonly
*
*
* A UCalendar object can produce all the time field values
* needed to implement the date-time formatting for a particular language
* and calendar style (for example, Japanese-Gregorian, Japanese-Traditional).
*
*
* When computing a UDate from time fields, two special circumstances
* may arise: there may be insufficient information to compute the
* UDate (such as only year and month but no day in the month),
* or there may be inconsistent information (such as "Tuesday, July 15, 1996"
* -- July 15, 1996 is actually a Monday).
*
*
* Insufficient information. The calendar will use default * information to specify the missing fields. This may vary by calendar; for * the Gregorian calendar, the default for a field is the same as that of the * start of the epoch: i.e., UCAL_YEAR = 1970, UCAL_MONTH = JANUARY, UCAL_DATE = 1, etc. * *
* Inconsistent information. If fields conflict, the calendar * will give preference to fields set more recently. For example, when * determining the day, the calendar will look for one of the following * combinations of fields. The most recent combination, as determined by the * most recently set single field, will be used. * * \htmlonly
\endhtmlonly *\endhtmlonly * * For the time of day: * * \htmlonly* \code * UCAL_MONTH + UCAL_DAY_OF_MONTH * UCAL_MONTH + UCAL_WEEK_OF_MONTH + UCAL_DAY_OF_WEEK * UCAL_MONTH + UCAL_DAY_OF_WEEK_IN_MONTH + UCAL_DAY_OF_WEEK * UCAL_DAY_OF_YEAR * UCAL_DAY_OF_WEEK + UCAL_WEEK_OF_YEAR * \endcode ** \htmlonly
\endhtmlonly *\endhtmlonly * ** \code * UCAL_HOUR_OF_DAY * UCAL_AM_PM + UCAL_HOUR * \endcode ** \htmlonly
* Note: for some non-Gregorian calendars, different * fields may be necessary for complete disambiguati