Java DateTime.isUtc方法代码示例

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Construct a new DateTime instance for floating times (no timezone).
 * If the specified date is not floating, then the instance is returned. 
 * 
 * This allows a floating time to be converted to an instant in time
 * depending on the specified timezone.
 * 
 * @param date floating date
 * @param tz timezone
 * @return new DateTime instance representing floating time pinned to
 *         the specified timezone
 */
public static DateTime pinFloatingTime(Date date, TimeZone tz) {
    
    try {   
        if(date instanceof DateTime) {
            DateTime dt = (DateTime) date;
            if(dt.isUtc() || dt.getTimeZone()!=null) {
                return dt;
            }
            else {
                return new DateTime(date.toString(), tz);
            }
        }
        else {
            return new DateTime(date.toString() + "T000000", tz);
        }
    } catch (ParseException e) {
        throw new CosmoParseException("error parsing date", e);
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Return a Date instance that represents the day that a point in
 * time translates into local time given a timezone.
 * @param utcDateTime point in time
 * @param tz timezone The timezone.
 * @return The date.
 */
public static Date normalizeUTCDateTimeToDate(DateTime utcDateTime, TimeZone tz) {
    if(!utcDateTime.isUtc()) {
        throw new IllegalArgumentException("datetime must be utc");
    }
    
    // if no timezone, use default
    if (tz == null) {
        return new Date(utcDateTime);
    }
    
    DateTime copy = (DateTime) Dates.getInstance(utcDateTime, utcDateTime);
    copy.setTimeZone(tz);
    
    try {
        return new Date(copy.toString().substring(0, 8));
    } catch (ParseException e) {
        throw new CosmoParseException("error creating Date instance", e);
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Return a DateTime instance that is normalized according to the
 * offset of the specified timezone as compared to the default
 * system timezone.
 * 
 * @param utcDateTime point in time
 * @param tz timezone The timezone.
 * @return The date.
 */
public static Date normalizeUTCDateTimeToDefaultOffset(DateTime utcDateTime, TimeZone tz) {
    if(!utcDateTime.isUtc()) {
        throw new IllegalArgumentException("datetime must be utc");
    }
    
    // if no timezone nothing to do
    if (tz == null) {
        return utcDateTime;
    }
    
    // create copy, and set timezone
    DateTime copy = (DateTime) Dates.getInstance(utcDateTime, utcDateTime);
    copy.setTimeZone(tz);
    
    
    // Create floating instance of local time, which will give
    // us the correct offset
    try {
        return new DateTime(copy.toString());
    } catch (ParseException e) {
        throw new CosmoParseException("error creating Date instance", e);
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Construct a TimeRangeFilter object from a DOM Element
 * @param element The DOM Element.
 * @throws ParseException - if something is wrong this exception is thrown.
 */
public TimeRangeFilter(Element element, VTimeZone timezone) throws ParseException {        
    // Get start (must be present)
    String start =
        DomUtil.getAttribute(element, ATTR_CALDAV_START, null);
    if (start == null) {
        throw new ParseException("CALDAV:comp-filter time-range requires a start time", -1);
    }
    
    DateTime trstart = new DateTime(start);
    if (! trstart.isUtc()) {
        throw new ParseException("CALDAV:param-filter timerange start must be UTC", -1);
    }

    // Get end (must be present)
    String end =
        DomUtil.getAttribute(element, ATTR_CALDAV_END, null);        
    DateTime trend = end != null ? new DateTime(end) : getDefaultEndDate(trstart);
    
    if (! trend.isUtc()) {
        throw new ParseException("CALDAV:param-filter timerange end must be UTC", -1);
    }

    setPeriod(new Period(trstart, trend));
    setTimezone(timezone);
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Construct a TimeRangeFilter object from a DOM Element
 * @param element The DOM Element.
 * @throws ParseException - if something is wrong this exception is thrown.
 */
public TimeRangeFilter(Element element, VTimeZone timezone) throws ParseException {
    // Get start (must be present)
    String start = DomUtils.getAttribute(element, ATTR_CALDAV_START);
    if (start == null) {
        throw new ParseException("CALDAV:comp-filter time-range requires a start time", -1);
    }

    DateTime trstart = new DateTime(start);
    if (! trstart.isUtc()) {
        throw new ParseException("CALDAV:param-filter timerange start must be UTC", -1);
    }

    // Get end (must be present)
    String end =
            DomUtils.getAttribute(element, ATTR_CALDAV_END);
    if (end == null) {
        //add one year to date start Iphone ios7 bug
        end = addOneYearToDateStart(start);
        //throw new ParseException("CALDAV:comp-filter time-range requires an end time", -1); 
    }

    DateTime trend = new DateTime(end);
    if (! trend.isUtc()) {
        throw new ParseException("CALDAV:param-filter timerange end must be UTC", -1);
    }

    setPeriod(new Period(trstart, trend));
    setTimezone(timezone);
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Copy a Date/DateTime and normalise to UTC if its not floating.
 * 
 * @param date The date.
 * @return The date.
 */
private Date copyNormalisedDate(Date date) {
    if (date instanceof DateTime) {
        DateTime dt = new DateTime(date);
        if (!dt.isUtc() && dt.getTimeZone() != null) {
            dt.setUtc(true);
        }
        return dt;
    } else {
        return new Date(date);
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Determine if a Date is floating.  A floating Date is a Date
 * instance or a DateTime that is not utc and does not have a timezone.
 * @param date The date.
 * @return true if the date is floating, otherwise false
 */
public static boolean isFloating(Date date) {
    if(date instanceof DateTime) {
        DateTime dt = (DateTime) date;
        return !dt.isUtc() && dt.getTimeZone()==null;
    } else {
        return true;
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Adjust a floating time if a timezone is present.  A floating time
 * is initially created with the default system timezone.  If a timezone
 * if present, we need to adjust the floating time to be in specified
 * timezone.  This allows a server in the US to return floating times for
 * a query made by someone whos timezone is in Australia.  If no timezone is
 * set for the InstanceList, then the system default timezone will be
 * used in floating time calculations.
 * <p/>
 * What happens is a floating time will get converted into a
 * date/time with a timezone.  This is ok for comparison and recurrence
 * generation purposes.  Note that Instances will get indexed as a UTC
 * date/time and for floating DateTimes, the the recurrenceId associated
 * with the Instance loses its "floating" property.
 *
 * @param date The date.
 * @return The date.
 */
private Date adjustFloatingDateIfNecessary(Date date) {
    if (timezone == null || !(date instanceof DateTime)) {
        return date;
    }

    DateTime dtDate = (DateTime) date;
    if (dtDate.isUtc() || dtDate.getTimeZone() != null) {
        return date;
    }

    try {
        return new DateTime(dtDate.toString(), timezone);
    } catch (ParseException e) {
        throw new CosmoParseException("error parsing date", e);
    }
}