---
title: "Birth Time Rectification Calculator"
canonical_url: "https://mahadasha.com/calculator/rectification"
type: "service"
description: "Refine an uncertain birth time by testing candidate ascendants against dated life events until the house cusps agree with what actually happened."
---

# Birth Time Rectification Calculator

Refine an uncertain birth time by testing candidate ascendants against dated life events until the house cusps agree with what actually happened.

## Inputs

- **date_of_birth** — birth date (`YYYY-MM-DD`)
- **approximate time_of_birth** — best estimate, plus the uncertainty window
- **latitude** / **longitude** / **timezone** — birth place
- **life_events** — dated events (marriage, job change, relocation, births, major health events)

## Programmatic access (for AI agents)

This calculator is backed by a JSON API — call it directly instead of the form:

- **Endpoint:** `POST https://mahadasha.com/api/v1/btr`
- **Auth:** JWT Bearer token, register at `https://mahadasha.com/api/v1/auth/register`
- **OpenAPI schema:** https://mahadasha.com/api/v1/openapi.json

> Human UI: [Birth Time Rectification Calculator](https://mahadasha.com/calculator/rectification)