Java8中的LocalDateTime工具类

浅浅的花香味﹌ 2022-05-27 13:36 192阅读 0赞

转自：https://blog.csdn.net/KingBoyWorld/article/details/75808108

工具类

package com.kingboy.common.utils.date; import java.time.*; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoUnit; import java.time.temporal.TemporalUnit; import java.util.Date; /* * @author kingboy * @Date 2017/7/22 下午2:12 * @Description LocalDateTimeUtils is used to Java8中的时间类 */ public class LocalDateTimeUtils { //获取当前时间的LocalDateTime对象 //LocalDateTime.now(); //根据年月日构建LocalDateTime //LocalDateTime.of(); //比较日期先后 //LocalDateTime.now().isBefore(), //LocalDateTime.now().isAfter(), //Date转换为LocalDateTime public static LocalDateTime convertDateToLDT(Date date) { return LocalDateTime.ofInstant(date.toInstant(), ZoneId.systemDefault()); } //LocalDateTime转换为Date public static Date convertLDTToDate(LocalDateTime time) { return Date.from(time.atZone(ZoneId.systemDefault()).toInstant()); } //获取指定日期的毫秒 public static Long getMilliByTime(LocalDateTime time) { return time.atZone(ZoneId.systemDefault()).toInstant().toEpochMilli(); } //获取指定日期的秒 public static Long getSecondsByTime(LocalDateTime time) { return time.atZone(ZoneId.systemDefault()).toInstant().getEpochSecond(); } //获取指定时间的指定格式 public static String formatTime(LocalDateTime time,String pattern) { return time.format(DateTimeFormatter.ofPattern(pattern)); } //获取当前时间的指定格式 public static String formatNow(String pattern) { return formatTime(LocalDateTime.now(), pattern); } //日期加上一个数,根据field不同加不同值,field为ChronoUnit.* public static LocalDateTime plus(LocalDateTime time, long number, TemporalUnit field) { return time.plus(number, field); } //日期减去一个数,根据field不同减不同值,field参数为ChronoUnit.* public static LocalDateTime minu(LocalDateTime time, long number, TemporalUnit field){ return time.minus(number,field); } /** * 获取两个日期的差 field参数为ChronoUnit.* * @param startTime * @param endTime * @param field 单位(年月日时分秒) * @return */ public static long betweenTwoTime(LocalDateTime startTime, LocalDateTime endTime, ChronoUnit field) { Period period = Period.between(LocalDate.from(startTime), LocalDate.from(endTime)); if (field == ChronoUnit.YEARS) return period.getYears(); if (field == ChronoUnit.MONTHS) return period.getYears() * 12 + period.getMonths(); return field.between(startTime, endTime); } //获取一天的开始时间，2017,7,22 00:00 public static LocalDateTime getDayStart(LocalDateTime time) { return time.withHour(0) .withMinute(0) .withSecond(0) .withNano(0); } //获取一天的结束时间，2017,7,22 23:59:59.999999999 public static LocalDateTime getDayEnd(LocalDateTime time) { return time.withHour(23) .withMinute(59) .withSecond(59) .withNano(999999999); } }

*  1
 *  2
 *  3
 *  4
 *  5
 *  6
 *  7
 *  8
 *  9
 *  10
 *  11
 *  12
 *  13
 *  14
 *  15
 *  16
 *  17
 *  18
 *  19
 *  20
 *  21
 *  22
 *  23
 *  24
 *  25
 *  26
 *  27
 *  28
 *  29
 *  30
 *  31
 *  32
 *  33
 *  34
 *  35
 *  36
 *  37
 *  38
 *  39
 *  40
 *  41
 *  42
 *  43
 *  44
 *  45
 *  46
 *  47
 *  48
 *  49
 *  50
 *  51
 *  52
 *  53
 *  54
 *  55
 *  56
 *  57
 *  58
 *  59
 *  60
 *  61
 *  62
 *  63
 *  64
 *  65
 *  66
 *  67
 *  68
 *  69
 *  70
 *  71
 *  72
 *  73
 *  74
 *  75
 *  76
 *  77
 *  78
 *  79
 *  80
 *  81
 *  82
 *  83
 *  84
 *  85
 *  86
 *  87
 *  88
 *  89
 *  90
 *  91
 *  92
 *  93
 *  94
 *  95
 *  96
 *  97
 *  98

测试类

package com.kingboy.common.localdatetimeutils;
    
    import com.kingboy.common.utils.date.LocalDateTimeUtils;
    import org.junit.Test;
    import java.time.LocalDateTime;
    import java.time.temporal.ChronoUnit;
    
    import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayEnd;
    import static com.kingboy.common.utils.date.LocalDateTimeUtils.getDayStart;
    
    /** * @author kingboy * @Date 2017/7/22 下午7:16 * @Description LocaDateTimeUtilsTest is used to 测试LocalDateTime工具 */
    public class LocaDateTimeUtilsTest {
    
        @Test
        public void format_test() {
            System.out.println(LocalDateTimeUtils.formatNow("yyyy年MM月dd日 HH:mm:ss"));
        }
    
        @Test
        public void betweenTwoTime_test() {
            LocalDateTime start = LocalDateTime.of(1993, 10, 13, 11, 11);
            LocalDateTime end = LocalDateTime.of(1994, 11, 13, 13, 13);
            System.out.println("年:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.YEARS));
            System.out.println("月:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MONTHS));
            System.out.println("日:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.DAYS));
            System.out.println("半日:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.HALF_DAYS));
            System.out.println("小时:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.HOURS));
            System.out.println("分钟:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MINUTES));
            System.out.println("秒:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.SECONDS));
            System.out.println("毫秒:" + LocalDateTimeUtils.betweenTwoTime(start, end, ChronoUnit.MILLIS));
            //=============================================================================================
            /* 年:1 月:13 日:396 半日:792 小时:9506 分钟:570362 秒:34221720 毫秒:34221720000 */
        }
    
        @Test
        public void plus_test() {
            //增加二十分钟
            System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),
                    20,
                    ChronoUnit.MINUTES), "yyyy年MM月dd日 HH:mm"));
            //增加两年
            System.out.println(LocalDateTimeUtils.formatTime(LocalDateTimeUtils.plus(LocalDateTime.now(),
                    2,
                    ChronoUnit.YEARS), "yyyy年MM月dd日 HH:mm"));
            //=============================================================================================
            /* 2017年07月22日 22:53 2019年07月22日 22:33 */
        }
    
        @Test
        public void dayStart_test() {
            System.out.println(getDayStart(LocalDateTime.now()));
            System.out.println(getDayEnd(LocalDateTime.now()));
            //=============================================================================================
            /* 2017-07-22T00:00 2017-07-22T23:59:59.999999999 */
        }
    
    }