Creating a date Sequence with the removal of the odds

Hello

I'm doing some sorting but I can't figure out how to do so...

I have about four columns

The First column

Is written like that

1/1/2010 00:00:00
1/1/2010 00:10:00
1/1/2010 00:20:00
1/1/2010 00:30:00
1/1/2010 00:40:00
1/1/2010 00:50:00
1/1/2010 01:00:00
1/1/2010 01:10:00
1/1/2010 01:20:00
1/1/2010 01:30:00
1/1/2010 01:40:00
1/1/2010 01:50:00
1/1/2010 02:00:00
1/1/2010 02:10:00
1/1/2010 02:20:00
1/1/2010 02:30:00
1/1/2010 02:40:00
1/1/2010 02:50:00
...
...

2/1/2010 00:00:00
2/1/2010 00:10:00
2/1/2010 00:20:00
2/1/2010 00:30:00
2/1/2010 00:40:00
2/1/2010 00:50:00
2/1/2010 01:00:00
2/1/2010 01:10:00
2/1/2010 01:20:00
2/1/2010 01:30:00
2/1/2010 01:40:00
2/1/2010 01:50:00
2/1/2010 02:00:00
2/1/2010 02:10:00
2/1/2010 02:20:00
2/1/2010 02:30:00
2/1/2010 02:40:00
2/1/2010 02:50:00

and so on..

Sometimes The machine is stop working and also stop recording to excel which will be like that

1/1/2010 00:00:00
1/1/2010 00:10:00
1/1/2010 00:40:00
1/1/2010 00:50:00
1/1/2010 01:00:00
1/1/2010 01:10:00
1/1/2010 01:20:00
1/1/2010 01:30:00
1/1/2010 01:40:00
1/1/2010 01:50:00

all I need to put a code that deletes all rows that it's group is not complete like
1/1/2010 00:00:00
1/1/2010 00:10:00
1/1/2010 00:40:00
1/1/2010 00:50:00
1/1/2010 01:00:00
1/1/2010 01:10:00
1/1/2010 01:20:00
1/1/2010 01:30:00
1/1/2010 01:40:00
1/1/2010 01:50:00

which will leave only these rows
1/1/2010 01:00:00
1/1/2010 01:10:00
1/1/2010 01:20:00
1/1/2010 01:30:00
1/1/2010 01:40:00
1/1/2010 01:50:00