java中12小时制转换24小时制方法

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java代码12小时制转换24小时制方法

str:12小时制字符串，比如8:00am,7:00pm.8:30am,6:00pm

返回值为24小时制字符串:比如18:00,20:00,21:00

public static String startStr(String str) {

       String[] strs = str.split("--");
       String total = strs[strs.length - 1];
       String startHour = total.substring(0, total.indexOf(":"));
       if ((total.charAt(total.indexOf("m") - 1) + "").equals("a")
               && (startHour.equals("12"))) {
           startHour = Integer.valueOf(startHour) - 12 + "";
       }
       if ((total.charAt(total.indexOf("m") - 1) + "").equals("p")
               && (!startHour.equals("12"))) {
           startHour = Integer.valueOf(startHour) + 12 + "";
       }
       if ((total.charAt(total.indexOf("m") - 1) + "").equals("p")
               && (startHour.equals("12"))) {
           startHour = Integer.valueOf(startHour) + "";
       }
       startHour += total
               .substring(total.indexOf(":"), total.indexOf("m") - 1);
       return startHour;
   }

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