'2013-07-21T23:59:59.000000000+0900',
'2013-07-21T05:59:59.000000000+0900',
'2013-07-21T05:59:59.000000000+0900',
'2013-07-21T05:59:59.000000000+0900',
'2013-07-20T10:59:59.000000000+0900',
'2013-07-20T10:59:59.000000000+0900',
'2013-07-20T09:59:59.000000000+0900',
'2013-07-20T09:59:59.000000000+0900',
'2013-07-20T09:59:59.000000000+0900',
How to move the datetime to end of day, week or hour