The Vimśottarī tree to five levels. Every boundary is an exact division of its parent — the last child ends precisely where the parent does — and the year length is named because it changes the answer. Nothing entered here is stored on our servers — your browser alone remembers your last-used details.
Year length: 365.25636 days (meanSiderealDrik) · running now: Jupiter → Ketu → Saturn → Moon
Ketu
1991-03-05 → 1991-03-17
Venus
1991-03-17 → 1991-04-22
Sun
1991-04-22 → 1991-05-02
Moon
1991-05-02 → 1991-05-20
Mars
1991-05-20 → 1991-06-02
Rahu
1991-06-02 → 1991-07-04
Jupiter
1991-07-04 → 1991-08-01
Saturn
1991-08-01 → 1991-09-04
Mercury
1991-09-04 → 1991-10-04
Boundary times are root-found and residual-verified, never interpolated. Change the convention and these numbers change — which is why it is printed beside them.