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
Mars
1991-05-20 → 1991-05-21
Rahu
1991-05-21 → 1991-05-23
Jupiter
1991-05-23 → 1991-05-24
Saturn
1991-05-24 → 1991-05-26
Mercury
1991-05-26 → 1991-05-28
Ketu
1991-05-28 → 1991-05-29
Venus
1991-05-29 → 1991-05-31
Sun
1991-05-31 → 1991-06-01
Moon
1991-06-01 → 1991-06-02
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.