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public class TestCalendar { 2. 3. @Test 4. public void test(){ 5. try { 6. Calendar calendar = new GregorianCalendar();//子类实例化 7. //获取年、月、日、时、分、秒、毫秒 8. System.out.println("年： "+calendar.get(Calendar.YEAR)); 9. System.out.println("月 "+(calendar.get(Calendar.MONTH)+1)); 10. System.out.println("日： "+calendar.get(Calendar.DAY_OF_MONTH)); 11. System.out.println("时： "+calendar.get(Calendar.HOUR_OF_DAY)); 12. System.out.println("分： "+calendar.get(Calendar.MINUTE)); 13. System.out.println("秒： "+calendar.get(Calendar.SECOND)); 14. System.out.println("毫秒 "+calendar.get(Calendar.MILLISECOND)); 15. 16. // 当前月第一天、最后一天 17. int currYear = calendar.get(Calendar.YEAR); 18. int currMonth = calendar.get(Calendar.MONTH) + 1; 19. System.out.print(currYear + "-" + currMonth); 20. SimpleDateFormat datef = new SimpleDateFormat("yyyy-MM-dd"); 21. calendar.set(Calendar.DAY_OF_MONTH, 1); 22. Date beginTime = calendar.getTime(); 23. String sTime = datef.format(beginTime) + " 00:00:00"; 24. calendar.set(Calendar.DATE, 1); 25. calendar.roll(Calendar.DATE, -1); 26. Date endTime = calendar.getTime(); 27. String eTime = datef.format(endTime) + " 23:59:59"; 28. System.out.println("第一天"+sTime+"最后一天"+eTime); 29. 30. Calendar cal = Calendar.getInstance(); 31. //指定年月的的第一天、最后一天 32. int year = 2015; 33. int moth = 3; 34. cal.set(Calendar.YEAR,year); 35. cal.set(Calendar.MONTH, moth-1); 36. //当前月的最后一天 37. cal.set( Calendar.DATE, 1 ); 38. cal.roll(Calendar.DATE, - 1 ); 39. Date endTime2=cal.getTime(); 40. String endTimeStr=datef.format(endTime2)+" 23:59:59"; 41. //当前月的第一天 42. cal.set(GregorianCalendar.DAY_OF_MONTH, 1); 43. Date beginTime2=cal.getTime(); 44. String beginTimeStr=datef.format(beginTime2)+" 00:00:00"; 45. 46. System.out.println("指定年月的的第一天"+endTimeStr+"最后一天"+beginTimeStr); 47. 48. //当前时间的前一天 49. SimpleDateFormat sdf2 = new SimpleDateFormat("yyyy-MM-dd:HH"); 50. String tmStr = "2015-5-18:00"; 51. Date d = sdf2.parse(tmStr); 52. System.out.println(d); 53. Calendar now = Calendar.getInstance(); 54. now.setTime(d); 55. now.set(Calendar.HOUR, now.get(Calendar.HOUR) -1); 56. System.out.println(sdf2.format(now.getTime())); 57. 58. //最近N天 59. SimpleDateFormat df2 = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss"); 60. cal.add(Calendar.DATE,-7); 61. System.out.println("最近7天"+df2.format(cal.getTime())); 62. Calendar ca2 =Calendar.getInstance(); 63. //最近N个月 64. ca2.add(Calendar.MONTH,-1);//最近一个月 65. System.out.println("最近一个月"+df2.format(ca2.getTime())); 66. Calendar ca3 =Calendar.getInstance(); 67. //最近N个年 68. ca3.add(Calendar.YEAR,-1);//最近一年 69. System.out.println("最近一年"+df2.format(ca3.getTime())); 70. } catch (Exception e) { 71. e.printStackTrace(); 72. } 73. } 74.}

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