Hi all,
my dataset is like that:

id data time
1 01jan2018
1 01jan2018
1 03jan2018
1 03jan2018
1 03jan2018
1 06jan2018
.... ................
2 01jan2018
2 01jan2018
2 01jan2018
2 01jan2018
2 05jan2018
2 05jan2018
2 07jan2018
.... ................

so, I want that to become

id data time
1 01jan2018
1 02jan2018
1 03jan2018
1 04jan2018
1 05jan2018
1 06jan2018
.... ................
2 01jan2018
2 02jan2018
2 03jan2018
2 04jan2018
2 05jan2018
2 06jan2018
2 07jan2018
.... ................


Could anyone help me?
Thanks for each reply.