时间

public class GetDate {

public GetDate(){}

public static Date getNowDate() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString=formatter.format(currentTime);
ParsePosition pos = new ParsePosition(8);
Date currentTime_2 = formatter.parse(dateString, pos);
return currentTime_2;
}
public static Date getNowDateShort() {
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString=formatter.format(currentTime);
ParsePosition pos = new ParsePosition(8);
Date currentTime_2 = formatter.parse(dateString, pos);
return currentTime_2;
}
public static String getStringDate(){
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(currentTime);
return dateString;
}
public static String getStringDateShort(){
Date currentTime = new Date();
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
String dateString = formatter.format(currentTime);
return dateString;
}
public static Date strToDate(String strDate){
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
ParsePosition pos=new ParsePosition(0);
Date strtodate=formatter.parse(strDate,pos);
return strtodate;
}
public static String dateToStr(java.util.Date dateDate){
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
String dateString = formatter.format(dateDate);
return dateString;
}
public static Date strToBirthday(String strDate){
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos=new ParsePosition(0);
Date strtodate=formatter.parse(strDate,pos);
return strtodate;
}
public static Date getNow(){
Date currentTime = new Date();
return currentTime;
}
public static long getS(String strDate){
SimpleDateFormat formatter = new SimpleDateFormat("yyyy-MM-dd");
ParsePosition pos=new ParsePosition(0);
Date strtodate=formatter.parse(strDate,pos);
return strtodate.getTime();
}

public static Date getLastDate(long day) {
Date date=new Date();
long date_3_hm=date.getTime()-3600000*34*day;
Date date_3_hm_date=new Date(date_3_hm);
return date_3_hm_date;
}
}



2.

1. mport java.util.Calendar;
2. import java.util.Date;
3. import java.text.*;
6. public class DateDealWith
7. {
8. public DateDealWith(){
9. }
10. //取得系统当前时间,格式为yyyy-mm-dd
11. public String getCurrentDate(){
12. Calendar rightNow = Calendar.getInstance();
13. int year=rightNow.get(rightNow.YEAR);
14. int month=rightNow.get(rightNow.MONTH)+1;
15. int day=rightNow.get(rightNow.DATE);
16. return year+"-"+month+"-"+day;
17. }
18. //取得系统当前时间,格式为yyyy年mm月dd日
19. public String getCurrentDate1(){
20. Calendar rightNow = Calendar.getInstance();
21. int year=rightNow.get(rightNow.YEAR);
22. int month=rightNow.get(rightNow.MONTH)+1;
23. int day=rightNow.get(rightNow.DATE);
24. return year+"年"+month+"月"+day+"日";
25. }
26. //取得系统当前时间前n个月的相对应的一天
27. public String getNMonthBeforeCurrentDay(int n){
28. Calendar c = Calendar.getInstance();
29. c.add(c.MONTH,-n);
30. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
32. }
33. //取得系统当前时间后n个月的相对应的一天
34. public String getNMonthAfterCurrentDay(int n){
35. Calendar c = Calendar.getInstance();
36. c.add(c.MONTH,n);
37. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
39. }
41. //取得系统当前时间前n天,格式为yyyy-mm-dd
42. public String getNDayBeforeCurrentDate(int n){
43. Calendar c = Calendar.getInstance();
44. c.add(c.DAY_OF_MONTH,-n);
45. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
46. }
47. //取得系统当前时间后n天,格式为yyyy-mm-dd
48. public String getNDayAfterCurrentDate(int n){
49. Calendar c = Calendar.getInstance();
50. c.add(c.DAY_OF_MONTH,n);
51. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
52. }
53. //---------------------------------------------------------------------
54. //取过去一个时间对应的系统当年的一天
55. public String getCurrentDateAfterPastDate(String sPastDate){
56. if(sPastDate!=null && !sPastDate.equals("")){
57. Date date=switchStringToDate(sPastDate);
58. Calendar c = Calendar.getInstance();
59. c.setTime(date);
60. int iPastYear=c.get(c.YEAR);
61. Calendar c1 = Calendar.getInstance();
62. int iCurrentYear=c1.get(c1.YEAR);
63. c.add(c.YEAR,iCurrentYear-iPastYear);
64. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
65. }else{
66. return null;
67. }
68. }
69. //-----------------------------------------------------------------
70. //将一个日期字符串转化成日期
71. public Date switchStringToDate(String sDate){
72. Date date=null;
73. try{
74. SimpleDateFormat df=new SimpleDateFormat("yyyy-MM-dd");
75. date=df.parse(sDate);
77. }catch(Exception e){
78. System.out.println("日期转换失败:"+e.getMessage());
79. }
80. return date;
81. }
83. //输入两个字符串型的日期，比较两者的大小
84. public boolean compareTwoDateBigOrSmall(String fromDate,String toDate){
85. Date dateFrom = this.switchStringToDate(fromDate);
86. Date dateTo = this.switchStringToDate(toDate);
87. if(dateFrom.before(dateTo)){
88. return true;
89. }else{
90. return false;
91. }
92. }
94. //将一个日期字符串转化成Calendar
95. public Calendar switchStringToCalendar(String sDate){
96. Date date = switchStringToDate(sDate);
97. Calendar c = Calendar.getInstance();
98. c.setTime(date);
99. return c;
100. }
101. //将一个日期转化成Calendar
102. public Calendar switchStringToCalendar(Date date){
103. Calendar c = Calendar.getInstance();
104. c.setTime(date);
105. return c;
106. }
107. //------------------------------------------------------------------------
108. //取得某个时间前n个月的相对应的一天
109. public String getNMonthBeforeOneDay(String sDate,int n){
110. Calendar c = switchStringToCalendar(sDate);
111. c.add(c.MONTH,-n);
112. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
114. }
115. //取得某个时间后n个月的相对应的一天
116. public String getNMonthAfterOneDay(String sDate,int n){
117. Calendar c = switchStringToCalendar(sDate);
118. c.add(c.MONTH,n);
119. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
121. }
123. //取得某个时间前n天,格式为yyyy-mm-dd
124. public String getNDayBeforeOneDate(String sDate,int n){
125. Calendar c = switchStringToCalendar(sDate);
126. c.add(c.DAY_OF_MONTH,-n);
127. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
128. }
129. //取得某个时间后n天,格式为yyyy-mm-dd
130. public String getNDayAfterOneDate(String sDate,int n){
131. Calendar c = switchStringToCalendar(sDate);
132. c.add(c.DAY_OF_MONTH,n);
133. return ""+c.get(c.YEAR)+"-"+(c.get(c.MONTH)+1)+"-"+c.get(c.DATE);
134. }
135. //判断系统当前时间是不是润年
136. public boolean isRunNian(){
137. java.util.Calendar rightNow = java.util.Calendar.getInstance();
138. int year=rightNow.get(rightNow.YEAR);
139. if(0==year%4 && (year%100!=0 || year%400==0)){
140. return true;
141. }else{
142. return false;
143. }
145. }
146. }