基于Jdk8日期工具
基本能覆盖日常开发所需日期处理
package com.xx.dubbo.dubboservice.utils; import java.time.*; import java.time.format.DateTimeFormatter; import java.time.temporal.ChronoUnit; import java.time.temporal.TemporalAdjusters; import java.time.temporal.WeekFields; import java.util.Date; import java.util.Locale; /** * 日期工具 * @description: * @author: gongchang * @time: 2020/5/6 9:43 */ public class DateUtil { //数据库格式的日期 public static final String SQL_MONTH = "yyyy-MM"; public static final String SQL_DATE = "yyyy-MM-dd"; public static final String SQL_TIME = "yyyy-MM-dd HH:mm:ss"; public static final String SQL_TIMESTAMP = "yyyy-MM-dd HH:mm:ss.SS"; //斜杠格式的日期 public static final String DATE = "yyyy/MM/dd"; public static final String TIMESTAMP = "yyyy/MM/dd HH:mm:ss.SS"; public static final String TIMESTAMP_SHORT = "yyyy/MM/dd HH:mm"; public static final String TIME = "HH:mm:ss"; public static final String TIME_SHORT = "HH:mm"; //不常用日期格式 public static final String CHINESEDATE = "yyyy年MM月dd日"; public static final String DATE_TIME = "yyyyMMddHHmmss"; public static final String DATE_TIME_DETAIL = "yyyyMMddHHmmssSS"; public static final String DATE_DAY = "yyyyMMdd"; public static final String DATE_HOUR = "yyyyMMddHH"; /** * 防止被实例化 */ private DateUtil(){ } /** * Date转LocalDateTime * 使用系统时区 * @param date * @return */ public static LocalDateTime dateToLocalDateTime(Date date){ Instant instant = date.toInstant(); return instant.atZone(ZoneId.systemDefault()).toLocalDateTime(); } /** * LocalDateTime转Date * 使用系统时区 * @param localDateTime * @return */ public static Date localDateTimeToDate(LocalDateTime localDateTime){ ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault()); return Date.from(zdt.toInstant()); } /** * 日期转字符串 * @param localDateTime * @param pattern * @return */ public static String dateTimeToStr(LocalDateTime localDateTime, String pattern) { DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern); return localDateTime.format(formatter); } /** * 将字符串日期解析为java.time.LocalDateTime * @param dateTimeStr * @param pattern * @return */ public static LocalDateTime strToLocalDateTime(String dateTimeStr, String pattern) { DateTimeFormatter formatter = DateTimeFormatter.ofPattern(pattern); return LocalDateTime.parse(dateTimeStr, formatter); } /** * 开始日期,补齐" 00:00:00" * * @param localDateTime * @return */ public static LocalDateTime getStartDateTimeWithHMS(LocalDateTime localDateTime) { return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MIN); } /** * 结束日期,补齐" 23:59:59" * @param localDateTime * @return */ public static LocalDateTime getEndDateWithHMS(LocalDateTime localDateTime){ return LocalDateTime.of(localDateTime.toLocalDate(), LocalTime.MAX); } public static LocalDateTime getAfterYears(LocalDateTime localDateTime, int count){ return localDateTime.plusYears(count); } public static LocalDateTime getAfterMonths(LocalDateTime localDateTime, int count){ return localDateTime.plusMonths(count); } public static LocalDateTime getAfterDays(LocalDateTime localDateTime, int count){ return localDateTime.plusDays(count); } public static LocalDateTime getAfterMinutes(LocalDateTime localDateTime, int count){ return localDateTime.plusMinutes(count); } public static LocalDateTime getAfterSeconds(LocalDateTime localDateTime, int count){ return localDateTime.plusSeconds(count); } /** * 获得当前年的第一天 * @param * @return */ public static LocalDateTime getYearFirstDay(LocalDateTime localDateTime) { return localDateTime.with(TemporalAdjusters.firstDayOfYear()); } /** * 获得当前年的最后一天 * @param * @return */ public static LocalDateTime getYearLastDay(LocalDateTime localDateTime) { return localDateTime.with(TemporalAdjusters.lastDayOfYear()); } /** * 获得当前月的第一天 * @param * @return */ public static LocalDateTime getMonthFirstDay(LocalDateTime localDateTime) { return localDateTime.with(TemporalAdjusters.firstDayOfMonth()); } /** * 获得当前月的最后一天 * @param * @return */ public static LocalDateTime getMonthLastDay(LocalDateTime localDateTime) { return localDateTime.with(TemporalAdjusters.lastDayOfMonth()); } /** * 获得当前星期的第一天 * @param localDateTime * @param locale 默认Locale.CHINA 周日为一周的第一天 * @return */ public static LocalDateTime getWeekFirstDay(LocalDateTime localDateTime, Locale locale) { return localDateTime.with(WeekFields.of(locale==null?Locale.CHINA:locale).dayOfWeek(),1); } /** * 获得当前星期的最后一天 * @param localDateTime * @param locale 默认默认Locale.CHINA 周日为一周的第一天 * @return */ public static LocalDateTime getWeekLastDay(LocalDateTime localDateTime, Locale locale) { return localDateTime.with(WeekFields.of(locale==null?Locale.CHINA:locale).dayOfWeek(),7); } /** * 计算两个日期之间相差年数 * @param smallDateTime 较小的时间 * @param bigDateTime 较大的时间 * @return 相差年数 */ public static int getYearDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime) { return (int)smallDateTime.until(bigDateTime, ChronoUnit.YEARS); } /** * 计算两个日期之间相差月数 * @param smallDateTime 较小的时间 * @param bigDateTime 较大的时间 * @return 相差月数 */ public static int getMonthDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime) { return (int)smallDateTime.until(bigDateTime, ChronoUnit.MONTHS); } /** * 计算两个日期之间相差的天数 * @param smallDateTime 较小的时间 * @param bigDateTime 较大的时间 * @return 相差天数 */ public static int getDayDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){ return (int)smallDateTime.until(bigDateTime, ChronoUnit.DAYS); } /** * 计算两个日期之间相差小时数 * @param smallDateTime 较小的时间 * @param bigDateTime 较大的时间 * @return 相差小时数 */ public static int getHourDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){ return (int)smallDateTime.until(bigDateTime, ChronoUnit.HOURS); } /** * 计算两个日期之间相差分钟数 * @param smallDateTime * @param bigDateTime * @return 相差分钟数 */ public static int getMinutesDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){ return (int)smallDateTime.until(bigDateTime, ChronoUnit.MINUTES); } /** * 计算两个日期之间相差秒数 * @param smallDateTime * @param bigDateTime * @return 相差秒数 */ public static int getSecondsDiff(LocalDateTime smallDateTime, LocalDateTime bigDateTime){ return (int)smallDateTime.until(bigDateTime, ChronoUnit.SECONDS); } public static void main(String[] args) { LocalDateTime now = LocalDateTime.now(); System.out.println(getAfterMonths(now, 1)); } }