A birth time shortly after 11 p.m. can produce different chart dates when apps use different day-boundary rules. Start with the hospital's recorded date, place, time zone, and original clock time, and check how each software handles the Zi hour before comparing charts.
Fix the original record first
Confirm the recorded date, place, time zone, and whether any late-night transfer or delayed registration occurred. A relative's memory of a late-night birth is useful context but may not settle the boundary, so keep written evidence and recollections separate.
Build a comparison of app rules
List how each app assigns the Zi hour and what it outputs for the same input, confirming the rules are reproducible before comparing charts. Do not use which personality description feels more accurate as evidence, because that creates circular reasoning. The chart helps organize the check, while the original record and software rules determine the date.