Due Date Calculator

Work & Installation — Input to Output Summary:

• Naegelé’s Rule:
  Due Date = LMP + 280 days
• Alternative (if cycle ≠ 28 days):
  Due Date=LMP+280 days+(Cycle Length−28)

Test the Conception Calculator with known sample cases: e.g., a regular 28-day cycle with a known ovulation date, to test the ovulation and conception date logic. Check the acceptance of inputs (cycle length 21- 35 days, unknown cycle length, due date input). Add a check on unrealistic values (e.g., cycle length less than 21 or greater than 40 days) and deal with irregular cycles through a disclaimer. Allow a switch of various input methods (LMP + cycle length, or due date). Visualize with a clear window-of-fertility highlighting. Ensure that the numeric date inputs are friendly and mobile-friendly. Add a disclaimer that the results are approximations and not factual, particularly when the menstrual cycles are irregular or when fertility problems are involved. Use pertinent keywords in headings and meta tags by default in order to achieve SEO. Make sure that it loads fast and is mobile-friendly, and the calculator logic takes into consideration sperm viability and ovulation timing. Lastly, adapt to the foreign audience (DD/MM/YYYY vs MM/DD/YYYY) provided that the locales of your audience contain Bangladesh (where it is used) and allow both of them.