What you need before you start
Review the exact fields, example values, validation rule, and effect of missing data before starting. Never accept an invented default for a required birth field.
Birth date
date required
Establishes the calendar and timing data used by the calculation.
Example: 1990-06-15
Validation: Use a valid calendar date that is not in the future.
If missing: The tool cannot produce a reliable result without this required value.
Local birth time
time required
Adds the time pillar or time-dependent detail when the method supports it.
Example: 12:00
Validation: Use a valid local time; leave it blank only when the field is optional.
If missing: The tool cannot produce a reliable result without this required value.