Use the Ederer-Myers-Mantel method when the number of time intervals is between 2 and 5 and your data are counts.
Use Dat's 0-1 matrix method when the number of time intervals is between 5 and 10 and your data are counts. The total number of cases in each time series must be greater than twice the number of time intervals. If your data are sparser than this consider using the empty cells method and combine results across time series.
Notes: Use methods for clustering in a single time series to examine the individual time series for clustering. Larsen's method and the empty cells method also provide a combined P-value when several time series are input.