Current UNIX timestamp
Function unix_timestamp() returns the UNIX timestamp of current time. You can also specify a input timestamp value.
Example:
spark-sql> select unix_timestamp();
unix_timestamp(current_timestamp(), yyyy-MM-dd HH:mm:ss)
1610174099
spark-sql> select unix_timestamp(current_timestamp, 'yyyy-MM-dd');
unix_timestamp(current_timestamp(), yyyy-MM-dd)
1610174365
UNIX timestamp string to date
Function from_unixtime(unix_time, format) can be used to convert UNIX time to Spark SQL date data type.
Example:
spark-sql> select from_unixtime(1610174365, 'yyyy-MM-dd');
from_unixtime(CAST(1610174365 AS BIGINT), yyyy-MM-dd)
2021-01-09
UNIX timestamp string to timestamp
Function from_unixtime(unix_time, format) can also be used to convert UNIX time to Spark SQL timestamp data type.
Example:
spark-sql> select from_unixtime(1610174099, 'yyyy-MM-dd HH:mm:ss');
from_unixtime(CAST(1610174099 AS BIGINT), yyyy-MM-dd HH:mm:ss)
2021-01-09 17:34:59