我需要从时间戳列四舍五入到最近的月初(时间戳格式)。
如何做到这一点?
例子:
TimestampColumn A: Rounded to these values
2012-01-07 18:18:29.923 2012-01-01 00:00:00.000
2012-01-14 12:58:13.122 2012-01-01 00:00:00.000
2012-06-09 17:10:30.787 2012-06-01 00:00:00.000
2012-05-31 09:29:43.870 2012-06-01 00:00:00.000
2012-10-22 12:09:47.067 2012-11-01 00:00:00.000
2012-10-15 04:35:11.013 2012-10-01 00:00:00.000