新增时间方法

ruoyi-common/src/main/java/com/ruoyi/common/utils/DateUtils.java

@@ -8,6 +8,7 @@ import java.time.LocalDateTime;
 import java.time.LocalTime;
 import java.time.ZoneId;
 import java.time.ZonedDateTime;
+import java.util.Calendar;
 import java.util.Date;
 import org.apache.commons.lang3.time.DateFormatUtils;
 
@@ -53,6 +54,16 @@ public class DateUtils extends org.apache.commons.lang3.time.DateUtils
         return dateTimeNow(YYYY_MM_DD);
     }
 
+    /**
+     * 获取当前日期, 默认格式为yyyy-MM
+     *
+     * @return String
+     */
+    public static String getMonth()
+    {
+        return dateTimeNow(YYYY_MM);
+    }
+
     public static final String getTime()
     {
         return dateTimeNow(YYYY_MM_DD_HH_MM_SS);
@@ -188,4 +199,27 @@ public class DateUtils extends org.apache.commons.lang3.time.DateUtils
         ZonedDateTime zdt = localDateTime.atZone(ZoneId.systemDefault());
         return Date.from(zdt.toInstant());
     }
+
+    /***
+     * 获取当前月份的前后N月份的时间
+     * @param dateStr 当前月份
+     * @param addMonth n,负数为以前
+     *
+     * @return
+     */
+    public static String lastMouth(String dateStr, int addMonth) throws ParseException {
+        SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM");
+        Date sourceDate = sdf.parse(dateStr);
+        Calendar cal = Calendar.getInstance();
+        cal.setTime(sourceDate);
+        cal.add(Calendar.MONTH, addMonth);
+        // 上个月的年和月
+        int month = cal.get(Calendar.MONTH) + 1;
+        int year = cal.get(Calendar.YEAR);
+        // 月第一天和最后一天
+        SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
+        System.out.println(year+"-"+month);
+        return year+"-"+month+" 00:00:00";
+    }
+
 }