Start_Level Keyword
Corresponding System Variable: !PDT.Start_Level Specifies the initial level of tick labels to be displayed on a Date/Time axis. The subsequent levels depend on the data range and the first level selected. Use the following index values for the Start_Level keyword:

7—Year

6—Quarter

5—Month

4—Week

3—Day

2—Hour

1—Minute

0—Second

–1—Auto-level