java 日期操作辅助类

FormatDate.java

 

 

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01	package com.ucit.ca.webApp.tool;

02

03	import java.util.*;

04	import java.text.*;

05

06	public class FormatDate {

07

08	public FormatDate() {

09

}

10

11	// 格式化日期为字符串 "yyyy-MM-dd   hh:mm"

12	public String formatDateTime(Date basicDate, String strFormat) {

13	SimpleDateFormat df = new SimpleDateFormat(strFormat);

14	return df.format(basicDate);

15

}

16

17	// 格式化日期为字符串 "yyyy-MM-dd   hh:mm"

18	public String formatDateTime(String basicDate, String strFormat) {

19	SimpleDateFormat df = new SimpleDateFormat(strFormat);

20	Date tmpDate = null;

21

try {

22	tmpDate = df.parse(basicDate);

23	} catch (Exception e) {

24	// 日期型字符串格式错误

25

}

26	return df.format(tmpDate);

27

}

28

29	// 当前日期加减n天后的日期，返回String (yyyy-mm-dd)

30	public String nDaysAftertoday(int n) {

31	SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

32	Calendar rightNow = Calendar.getInstance();

33	// rightNow.add(Calendar.DAY_OF_MONTH,-1);

34	rightNow.add(Calendar.DAY_OF_MONTH, +n);

35	return df.format(rightNow.getTime());

36

}

37

38	// 当前日期加减n天后的日期，返回String (yyyy-mm-dd)

39	public Date nDaysAfterNowDate(int n) {

40	Calendar rightNow = Calendar.getInstance();

41	// rightNow.add(Calendar.DAY_OF_MONTH,-1);

42	rightNow.add(Calendar.DAY_OF_MONTH, +n);

43	return rightNow.getTime();

44

}

45

46	// 给定一个日期型字符串，返回加减n天后的日期型字符串

47	public String nDaysAfterOneDateString(String basicDate, int n) {

48	SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

49	Date tmpDate = null;

50

try {

51	tmpDate = df.parse(basicDate);

52	} catch (Exception e) {

53	// 日期型字符串格式错误

54

}

55	long nDay = (tmpDate.getTime() / (24 * 60 * 60 * 1000) + 1 + n)

56	* (24 * 60 * 60 * 1000);

57	tmpDate.setTime(nDay);

58

59	return df.format(tmpDate);

60

}

61

62	// 给定一个日期，返回加减n天后的日期

63	public Date nDaysAfterOneDate(Date basicDate, int n) {

64	long nDay = (basicDate.getTime() / (24 * 60 * 60 * 1000) + 1 + n)

65	* (24 * 60 * 60 * 1000);

66	basicDate.setTime(nDay);

67

68	return basicDate;

69

}

70

71	// 计算两个日期相隔的天数

72	public int nDaysBetweenTwoDate(Date firstDate, Date secondDate) {

73	int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000));

74	return nDay;

75

}

76

77	// 计算两个日期相隔的天数

78	public int nDaysBetweenTwoDate(String firstString, String secondString) {

79	SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd");

80	Date firstDate = null;

81	Date secondDate = null;

82

try {

83	firstDate = df.parse(firstString);

84	secondDate = df.parse(secondString);

85	} catch (Exception e) {

86	// 日期型字符串格式错误

87

}

88

89	int nDay = (int) ((secondDate.getTime() - firstDate.getTime()) / (24 * 60 * 60 * 1000));

90	return nDay;

91

}

92

93

}