Age = calendar difference between “As of Date” and “Date of Birth” (years, then months, then days).
Total days lived uses exact calendar day count between the two dates.
Breakdown converts total days into weeks/hours/minutes/seconds (7, 24, 60, 60 multipliers).
Next birthday is the next occurrence of your birth month/day after the “As of Date”.
For Feb 29 birthdays in non-leap years, this tool uses Feb 28.
Validation: DOB must not be after the “As of” date.
Tip: Leave “As of Date” blank to use today automatically.
Edge cases & notes
If you enter a future DOB relative to “As of Date”, you’ll be prompted to correct the dates.
Calendar math is precise (uses PHP’s DateTime::diff())—it respects varying month lengths and leap years.
“Weeks/hours/minutes/seconds” are derived from the exact day count (not average month lengths).
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