Personal calculator app: - Income: GROSS, NET, types of insurance, deductions, personal income tax - PIT - Interest rates: Loans, Savings deposits - Vehicle price: From the negotiated car price, calculate the rolling price - Calendar number: Calendar of Yin-Yang-Can Chi, additional information by date and time - Age: Calculate age by date of birth, life, life card, and weather - Translation: Get the Mai Hoa Dich hexagram according to the date and time - Circadian rhythms and Day 0 - BMI index