Technolila Webtools
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Time is Relative

Your age isn't just a number of years. It's a continuous timeline. We experience time linearly, but measuring it in smaller units like seconds or weeks reveals the sheer scale of our existence.

Age in Seconds, Weeks & Days

Calculate Your Exact Age

The Technical Proof

The age calculation is derived from the difference in Unix Time (seconds elapsed since Thursday, 1 January 1970 UTC). The formula for exact age in seconds (\( A_{sec} \)) is:

$$ A_{sec} = T_{now} - T_{dob} $$

Where:

  • \( T_{now} \): Current Unix Timestamp (sourced from server NTP-synced clock).
  • \( T_{dob} \): Unix Timestamp of the user-provided Date of Birth at 00:00:00 UTC.

For derived units (Weeks, Days), we handle the Gregorian calendar irregularities (Leap Years) by using the average seconds in a Gregorian year (365.2425 days) for long-term approximation in some contexts, but for this specific tool, we use exact integer division of the total seconds:

$$ Weeks = \lfloor \frac{A_{sec}}{604,800} \rfloor $$

Validation: PHP 8.x `DateTime` and `time()` functions interacting with 64-bit integer timestamps to prevent Year 2038 problem.

Step-by-Step Logic

  1. Input Parsing: The system accepts a text date string (YYYY-MM-DD) and creates a `DateTime` immutable object.
  2. Timestamp Conversion: Both the Input Date and Current Time are converted to signed integer timestamps.
  3. Delta Calculation: Subtraction occurs: Current Time - Birth Time.
  4. Unit Division:
    • Seconds: The raw delta.
    • Minutes: Delta / 60.
    • Hours: Delta / 3600.
    • Days: Delta / 86400.
    • Weeks: Delta / 604800.
  5. Real-Time Update: A Client-Side JavaScript interval runs every 1000ms to increment the lived seconds without page refresh.