搜集整理比较常用的时间工具类，记录一下。
1 /**
2 * LocalDateTime 转 时间
3 */
4 public static String localDateTimeToDateTime(LocalDateTime localDateTime) {
5 return DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss").format(localDateTime);
6 }
7
8 /**
9 * LocalDateTime 转 日期
10 */
11 public static String localDateTimeToDate(LocalDateTime localDateTime) {
12 return DateTimeFormatter.ofPattern("yyyy-MM-dd").format(localDateTime);
13 }
14
15 /**
16 * 转时间戳
17 */
18 public static String parseTimestamp(Date date) {
19 SimpleDateFormat format = new SimpleDateFormat("yyyyMMddHHmmssSSS");
20 return format.format(date);
21 }
22
23 /**
24 * 转时间格式
25 */
26 public static String parseYYYYMMDDHHMMSS(String date) {
27 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
28 return simpleDateFormat.format(date);
29 }
30
31 /**
32 * Date转ISO8601
33 */
34 public static String datetimeParseISO8601(Date date) {
35 SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
36 return iso8601DateFormat.format(date);
37 }
38
39 /**
40 * iso8601转时间格式
41 */
42 public static String iso8601ToDateTime(String date) {
43 SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSSXXX");
44 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
45 String d = "";
46 try {
47 d = simpleDateFormat.format(iso8601DateFormat.parse(date));
48 } catch (ParseException e) {
49 ByteArrayOutputStream bos = new ByteArrayOutputStream();
50 e.printStackTrace(new PrintStream(bos));
51 log.warn("--->时间转换异常：" + bos);
52 }
53 return d;
54 }
55
56 /**
57 * iso8601（UTC）转时间格式
58 *
59 * @param date
60 * @return
61 */
62 public static String iso8601UTCToDateTime(String date) {
63 SimpleDateFormat iso8601DateFormat = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ssXXX");
64 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
65 String d = "";
66 try {
67 d = simpleDateFormat.format(iso8601DateFormat.parse(date));
68 } catch (ParseException e) {
69 ByteArrayOutputStream bos = new ByteArrayOutputStream();
70 e.printStackTrace(new PrintStream(bos));
71 log.warn("--->时间转换异常：" + bos);
72 }
73 return d;
74 }
75
76 /**
77 * 时间转换
78 */
79 public static String parseYMD(Date date) {
80 SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
81 return formatYMD.format(date);
82 }
83
84 /**
85 * 将Date转String
86 */
87 public static String dateFormatZh(Date date) {
88 SimpleDateFormat simpleDateFormatZh = new SimpleDateFormat("yyyy年M月d日 HH:mm:ss");
89 return simpleDateFormatZh.format(date);
90 }
91
92 /**
93 * 将String转Date
94 */
95 public static Date toDate(String date) {
96 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
97 Date d = null;
98 try {
99 d = simpleDateFormat.parse(date);
100 } catch (ParseException e) {
101 ByteArrayOutputStream bos = new ByteArrayOutputStream();
102 e.printStackTrace(new PrintStream(bos));
103 log.warn("--->时间转换异常：" + " " + bos);
104 }
105 return d;
106 }
107
108 /**
109 * 将Date转String
110 */
111 public static String dateFormatMD(Date date) {
112 SimpleDateFormat simpleDateFormatZhMin = new SimpleDateFormat("M月d日");
113 return simpleDateFormatZhMin.format(date);
114 }
115
116 /**
117 * 根据时间获取当月天数
118 */
119 public static int getDayByMonth(String time) {
120 int day;
121 int year = Integer.parseInt(time.split("-")[0]);
122 int month = Integer.parseInt(time.split("-")[1]);
123 if (2 == month) {
124 day = year % 4 == 0 ? 29 : 28;
125 } else {
126 if (month == 8 || month == 12) {
127 day = 31;
128 } else if (month == 9 || month == 11) {
129 day = 30;
130 } else {
131 day = month % 2 == 0 ? 30 : 31;
132 }
133 }
134 return day;
135 }
136
137 /**
138 * 获取时间所在星期第几天
139 */
140 public static int getDayOfWeek(String time) {
141 LocalDate localDate = LocalDate.fromDateFields(CalendarUtils.toDate(time));
142 return localDate.dayOfWeek().get();
143 }
144
145 /**
146 * 获取时间所在月份第几天
147 */
148 public static int getDayOfMonth(String time) {
149 LocalDate localDate = LocalDate.fromDateFields(CalendarUtils.toDate(time));
150 return localDate.dayOfMonth().get();
151 }
152
153 /**
154 * 获取本周第一天
155 */
156 public static String getFirstOfWeek() {
157 SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
158 Calendar calendar = Calendar.getInstance();
159 calendar.add(Calendar.WEEK_OF_MONTH, 0);
160 calendar.set(Calendar.DAY_OF_WEEK, 2);
161 Date time = calendar.getTime();
162 return formatYMD.format(time);
163 }
164
165 /**
166 * 获取本周最后一天
167 */
168 public static String getLastOfWeek() {
169 SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
170 Calendar calendar = Calendar.getInstance();
171 calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));
172 calendar.add(Calendar.DAY_OF_WEEK, 1);
173 Date time = calendar.getTime();
174 return formatYMD.format(time);
175 }
176
177
178 /**
179 * 获取时间所在星期的第一天
180 *
181 * @param time yyyy-MM-dd
182 * @return
183 */
184 public static String getFirstOfWeek(String time) throws ParseException {
185 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
186 SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
187 time = time + " " + "23:59:59";
188 Calendar calendar = Calendar.getInstance();
189 calendar.setTime(simpleDateFormat.parse(time));
190 calendar.add(Calendar.WEEK_OF_MONTH, 0);
191 calendar.set(Calendar.DAY_OF_WEEK, 2);
192 Date date = calendar.getTime();
193 return formatYMD.format(date);
194 }
195
196 /**
197 * 获取时间所在星期的最后一天
198 *
199 * @param time yyyy-MM-dd
200 * @return
201 */
202 public static String getLastOfWeek(String time) throws ParseException {
203 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
204 SimpleDateFormat formatYMD = new SimpleDateFormat("yyyy-MM-dd");
205 time = time + " " + "00:00:00";
206 Calendar calendar = Calendar.getInstance();
207 calendar.setTime(simpleDateFormat.parse(time));
208 calendar.set(Calendar.DAY_OF_WEEK, calendar.getActualMaximum(Calendar.DAY_OF_WEEK));
209 calendar.add(Calendar.DAY_OF_WEEK, 1);
210 Date date = calendar.getTime();
211 return formatYMD.format(date);
212 }
213
214 /**
215 * 获取时间所在月份的第一天
216 */
217 public static String getFirstDayOfMonth(String time) throws ParseException {
218 String year = time.split("-")[0];
219 String month = time.split("-")[1];
220 return year + "-" + month + "-" + "01";
221 }
222
223
224 /**
225 * 获取时间所在月份的最后一天
226 */
227 public static String getLastDayOfMonth(String time) throws ParseException {
228 String year = time.split("-")[0];
229 String month = time.split("-")[1];
230 int days = CalendarUtils.getDayByMonth(time);
231 return year + "-" + month + "-" + days;
232 }
233
234 /**
235 * 获取时间戳（UTC）
236 *
237 * @return
238 */
239 public long getTimestamp() {
240 return LocalDateTime.now().toEpochSecond(ZoneOffset.of("+8"));
241 }
242
243
244 /**
245 * 指定日期x分钟以前的时间
246 *
247 * @param minutes 分钟
248 * @param current_time 日期
249 * @return
250 */
251 public static Date getBefordDateTime(int minutes, String current_time) throws ParseException {
252 SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
253 String before_time = simpleDateFormat.format(CalendarUtils.toDate(current_time).getTime() - (long) minutes * 60 * 1000);
254 return simpleDateFormat.parse(before_time);
255 }