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Swift code to calculate age in years, months and days from a person's dob
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| // Updated to swift 4.2 | |
| func calculateAge(dob : String) -> (Int, Int, Int){ | |
| let df = DateFormatter() | |
| df.dateFormat = "yyyy-MM-dd" | |
| let date = df.date(from: dob) | |
| guard let val = date else { | |
| return (0, 0, 0) | |
| } | |
| var years = 0 | |
| var months = 0 | |
| var days = 0 | |
| let cal = NSCalendar.current | |
| years = cal.component(.year, from: NSDate() as Date) - cal.component(.year, from: val) | |
| let currMonth = cal.component(.month, from: NSDate() as Date) | |
| let birthMonth = cal.component(.month, from: val) | |
| //get difference between current month and birthMonth | |
| months = currMonth - birthMonth | |
| //if month difference is in negative then reduce years by one and calculate the number of months. | |
| if months < 0 | |
| { | |
| years = years - 1 | |
| months = 12 - birthMonth + currMonth | |
| if cal.component(.day, from: NSDate() as Date) < cal.component(.day, from: val){ | |
| months = months - 1 | |
| } | |
| } else if months == 0 && cal.component(.day, from: NSDate() as Date) < cal.component(.day, from: val) | |
| { | |
| years = years - 1 | |
| months = 11 | |
| } | |
| //Calculate the days | |
| if cal.component(.day, from: NSDate() as Date) > cal.component(.day, from: val){ | |
| days = cal.component(.day, from: NSDate() as Date) - cal.component(.day, from: val) | |
| } | |
| else if cal.component(.day, from: NSDate() as Date) < cal.component(.day, from: val) | |
| { | |
| let today = cal.component(.day, from: NSDate() as Date) | |
| let date = cal.date(byAdding: .month, value: -1, to: NSDate() as Date) | |
| days = (cal.component(.day, from: date!) - cal.component(.day, from: val)) + today | |
| } else | |
| { | |
| days = 0 | |
| if months == 12 | |
| { | |
| years = years + 1 | |
| months = 0 | |
| } | |
| } | |
| return (years, months, days) | |
| } |
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