How it works
Enter the original date of birth.
The calculator adds six calendar months.
It returns the half birthday date and helpful date details.
Month-end rule: when the target month has fewer days, the calculator uses that month’s final valid day.
Frequently asked questions
What is a half birthday?
It is the date six calendar months after a birthday.
Is it always 182.5 days later?
No. Calendar months have different lengths, so adding six months is more accurate than adding a fixed number of days.
Does the calculator store my date?
No. Everything runs locally in your browser.
Date & Time Calculation Disclaimer
Results are estimates generated locally in your browser using standard calendar and time-zone assumptions. They are for informational purposes only. Confirm exact dates and times against official sources for anything time-critical. VisionVix accepts no liability for decisions based on this tool's output.
