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 → Rahu
Mercury
1991-04-15 → 1991-04-15
Ketu
1991-04-15 → 1991-04-16
Venus
1991-04-16 → 1991-04-16
Sun
1991-04-16 → 1991-04-17
Moon
1991-04-17 → 1991-04-17
Mars
1991-04-17 → 1991-04-17
Rahu
1991-04-17 → 1991-04-18
Jupiter
1991-04-18 → 1991-04-19
Saturn
1991-04-19 → 1991-04-20
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.