Hive常用时间函数总结

获取当前时间 >>> select current_date;
0: jdbc:hive2://linux01:10000> select current_date;
+-------------+
|     _c0     |
+-------------+
| 2020-09-14  |
+-------------+

获取当前时间

0: jdbc:hive2://linux01:10000> select current_timestamp;
+-------------------------+
|           _c0           |
+-------------------------+
| 2020-09-14 17:16:19.88  |
+-------------------------+

获取当前时间戳 >>> select UNIX_TIMESTAMP();
0: jdbc:hive2://linux01:10000> select UNIX_TIMESTAMP();
+-------------+
|     _c0     |
+-------------+
| 1600074118  |
+-------------+

获取当前的前1天或前两天 >>> select date_sub(CURRENT_DATE,1);

注：前2天就将 1 改成2 即可

注：后两天就将 1 改成 -2 就行可以根据正负进行加减天数
0: jdbc:hive2://linux01:10000> 
0: jdbc:hive2://linux01:10000> select date_sub(CURRENT_DATE,1);
+-------------+
|     _c0     |
+-------------+
| 2020-09-13  |
+-------------+

现在是当月的第几天

> select dayofmonth(current_date) 今天是9月22日

0: jdbc:hive2://emr-header-1:10000> select dayofmonth(current_date);
WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.
+------+
| _c0  |
+------+
| 22   |
+------+

获取当月月份 >>> select substr(current_date , 1 ,7 );
0: jdbc:hive2://linux01:10000> select substr(current_date , 1 ,7 );
+----------+
|   _c0    |
+----------+
| 2020-09  |
+----------+

获取本月月初第一天 >>> select date_sub(current_date,dayofmonth(current_date)-1);
0: jdbc:hive2://linux01:10000> 
0: jdbc:hive2://linux01:10000> select date_sub(current_date,dayofmonth(current_date)-1);
+-------------+
|     _c0     |
+-------------+
| 2020-09-01  |
+-------------+

获取本月月末 >>> select last_day(current_date) ;

0: jdbc:hive2://linux01:10000> 
0: jdbc:hive2://linux01:10000> select last_day(current_date) ;
+-------------+
|     _c0     |
+-------------+
| 2020-09-30  |
+-------------+

查询下个月的第一天 >>> select add_months(date_sub(current_date,dayofmonth(current_date)-1),1);
0: jdbc:hive2://linux01:10000> select add_months(date_sub(current_date,dayofmonth(current_date)-1),1);
+-------------+
|     _c0     |
+-------------+
| 2020-10-01  |
+-------------+

查询上个月月份 >>> select substr(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 ) ,1, 7);

注：如果想查询前6个月等将 -1 改成 -6 即可，查询后半年的将-1 改成 6 即可
0: jdbc:hive2://linux01:10000>  select substr(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 ) ,1, 7);
+----------+
|   _c0    |
+----------+
| 2020-08  |
+----------+

获取上个月的今天 >>> select add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 );

注要是想获取前两个月就将-1改成 -2 ，
0: jdbc:hive2://linux01:10000> select add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 );
+-------------+
|     _c0     |
+-------------+
| 2020-08-14  |
+-------------+

获取上个月的最后一天 >>> select last_day(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 ) )

注：想获取得上上个月的月末可以将 -1 改成 -2 ，可根据你的需要时间进行修改

获取下下个月的将 -1 改成 2 即可可根据你的需要时间进行修改
0: jdbc:hive2://linux01:10000> select last_day(add_months(FROM_UNIXTIME(UNIX_TIMESTAMP(),'yyyy-MM-dd HH:mm:ss'), -1 ) ) ;
+-------------+
|     _c0     |
+-------------+
| 2020-08-31  |
+-------------+

获取某月的天数

select datediff (last_day("2020-08-22") , date_sub("2020-08-22",dayofmonth("2020-08-22")-1) ) ;

注 current_date
0: jdbc:hive2://emr-header-1:10000> select  datediff (last_day(current_date) ,  date_sub(current_date,dayofmonth(current_date)));
WARNING: Hive-on-MR is deprecated in Hive 2 and may not be available in the future versions. Consider using a different execution engine (i.e. spark, tez) or using Hive 1.X releases.
+------+
| _c0  |
+------+
| 30   |
+------+
注：上面的是先获取当月月初+月末时间，求时间差测试的是9月份的数据

Hive获取当前时间-月初-月末-时间差-某月的天数--函数

Hive常用时间函数总结

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