Java中各种时间类型转Calendar

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本文介绍了一种实用的时间类型转换工具类，该工具类能够帮助开发者实现多种时间类型的相互转换，包括LocalDateTime、ZonedDateTime、LocalDate、Date、Timestamp、Instant到Calendar之间的转换。

package com.nextop.utils;

import java.sql.Timestamp;
import java.time.*;
import java.util.Calendar;
import java.util.Date;
import java.util.GregorianCalendar;

/**
 * @description: 时间类型转换
 * @author: Sarira
 * @date: 2020/9/27 11:23
 */
public class DateUtilsConvert {
    
    //LocalDateTime转Calendar
    public static Calendar convertLDTTOCalendar(LocalDateTime localDateTime) {
        Calendar localDateTimeCalendar = GregorianCalendar.from(ZonedDateTime.of(localDateTime, ZoneId.systemDefault()));
        return localDateTimeCalendar;
    }

    //ZonedDateTime转Calendar
    public static Calendar convertZDTTOCalendar(ZonedDateTime zonedDateTime) {
        Calendar zonedDateTimeInstantCalendar = GregorianCalendar.from(zonedDateTime);
        return zonedDateTimeInstantCalendar;
    }

    //LocalDate转Calendar
    public static Calendar convertLDTOCalendar(LocalDate localDate) {
        Calendar localDateCalendar = GregorianCalendar.from(localDate.atStartOfDay(ZoneId.systemDefault()));
        return localDateCalendar;
    }
    //Date转Calendar
    public static Calendar convertDTOCalendar(Date date) {
        Calendar dateCalendar = Calendar.getInstance();
        dateCalendar.setTime(date);
        return dateCalendar;
    }

    //Timestamp转Calendar
    public static Calendar convertTimeStampTOCalendar(Timestamp timestamp) {
        Calendar timestampCalendar = Calendar.getInstance();
        timestampCalendar.setTimeInMillis(timestamp.getTime());
        return timestampCalendar;
    }
    
    //Instant转Calendar
    public static Calendar convertInstantTOCalendar(Instant instant) {
        Calendar instantCalendar = GregorianCalendar.from(ZonedDateTime.ofInstant(instant, ZoneId.systemDefault()));
        return instantCalendar;
    }
}