Specify the beginning and the end:
(t/new-interval (t/date-time "2000-01-01T00:00")
(t/date-time "2001-01-01T00:00"))
{:tick/beginning (t/date-time "2000-01-01T00:00")
:tick/end (t/date-time "2001-01-01T00:00")}
(t/bounds (t/year 2000))
All of the above result in the same interval:
(= (t/new-interval (t/date-time "2000-01-01T00:00")
(t/date-time "2001-01-01T00:00"))
(t/bounds (t/year 2000))
{:tick/beginning (t/date-time "2000-01-01T00:00")
:tick/end (t/date-time "2001-01-01T00:00")})