Java DateTime.toString方法代码示例

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
private String fromDateToStringNoTimezone(Date date) {
    if(date==null) {
        return null;
    }
    
    if(date instanceof DateTime) {
        DateTime dt = (DateTime) date;
        // If DateTime has a timezone, then convert to UTC before
        // serializing as String.
        if(dt.getTimeZone()!=null) {
            // clone instance first to prevent changes to original instance
            DateTime copy = new DateTime(dt);
            copy.setUtc(true);
            return copy.toString();
        } else {
            return dt.toString();
        }
    } else {
        return date.toString();
    }
}
 

import net.fortuna.ical4j.model.DateTime; //导入方法依赖的package包/类
/**
 * Converts an ical4j Date instance to a string representation.  If the instance
 * is a DateTime and has a timezone, then the string representation will be
 * UTC.
 * @param date date to format
 * @return string representation of date
 */
public static String fromDateToStringNoTimezone(Date date) {
    if(date==null) {
        return null;
    }
    
    if(date instanceof DateTime) {
        DateTime dt = (DateTime) date;
        // If DateTime has a timezone, then convert to UTC before
        // serializing as String.
        if(dt.getTimeZone()!=null) {
            // clone instance first to prevent changes to original instance
            DateTime copy = new DateTime(dt);
            copy.setUtc(true);
            return copy.toString();
        } else {
            return dt.toString();
        }
    } else {
        return date.toString();
    }
}
 

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);
    }
}