Use the Calendar Object of java to obtain the last few degrees of start and end time of the current date, javacalendar

Use the Calendar Object of java to obtain the last few degrees of start and end time of the current date, javacalendar

Ideas:

Obtain the start and end dates of the current quarter, and push the start and end dates of the previous quarter three months forward based on the current date.

/*** @ Param flag true: Start date; false: end date * @ return */public static String getLastQuarterTime (boolean flag) {SimpleDateFormat required SDF = new SimpleDateFormat ("yyyy-MM-dd"); SimpleDateFormat longSdf = new SimpleDateFormat ("yyyy-MM-dd HH: mm: ss "); string resultDate = ""; Date now = null; try {Calendar calendar = Calendar. getInstance (); int currentMonth = calendar. get (Calendar. MONTH) + 1; // true: Start date; false: end date if (flag) {if (currentMonth> = 1 & currentMonth <= 3) calendar. set (Calendar. MONTH, 0); else if (currentMonth> = 4 & currentMonth <= 6) calendar. set (Calendar. MONTH, 3); else if (currentMonth> = 7 & currentMonth <= 9) calendar. set (Calendar. MONTH, 6); else if (currentMonth> = 10 & currentMonth <= 12) calendar. set (Calendar. MONTH, 9); calendar. set (Calendar. DATE, 1); now = longSdf. parse (fig. format (calendar. getTime () + "00:00:00");} else {if (currentMonth> = 1 & currentMonth <= 3) {calendar. set (Calendar. MONTH, 2); calendar. set (Calendar. DATE, 31);} else if (currentMonth> = 4 & currentMonth <= 6) {calendar. set (Calendar. MONTH, 5); calendar. set (Calendar. DATE, 30);} else if (currentMonth >=7 & currentMonth <= 9) {calendar. set (Calendar. MONTH, 8); calendar. set (Calendar. DATE, 30);} else if (currentMonth >=10 & currentMonth <= 12) {calendar ar. set (Calendar. MONTH, 11); calendar. set (Calendar. DATE, 31);} now = longSdf. parse (fig. format (calendar. getTime () + "23:59:59");} calendar. setTime (now); // set the date calendar. add (Calendar. MONTH,-3); resultDate = longSdf. format (calendar. getTime ();} catch (Exception e) {;} return resultDate ;}