Skin gets its color primarily from melanin, a pigment produced by melanocyte cells in the skin. The darker the skin, the more melanin it contains [source: MedicineNet ]. Freckles and beauty marks likewise indicate a higher concentration of the pigment in certain areas. Melanin also performs another vital function: It protects the skin against harmful UV rays.
APB Opinion No. 25, Accounting for Stock Issued to Employees, specifies that the measurement date for determining compensation cost in stock option, purchase, and award plans is the first date on which are known both (a) the number of shares that an individual employee is entitled to receive and (b) the option or purchase price, if any.
The Epoch is January 1st, 1970, midnight, on UNIX systems. On other systems, look at the results of time.gmtime(0) to discover the date of the Epoch. Measuring time in seconds since the Epoch is convenient for storage and comparing dates, because you only have a single number to consider. The tuple contains several values, arranged the following way: year, month 1-12, day 1-31, hour 0-23, minutes 0-59, seconds 0-61, day 0-6 (Mon-Sun), day 1-366, and DST -1,0,+1.