in html form, Enter the date range about (1900 ~ now), when i use mktime function mktime(0,0,0, $month, $day, $year), and value of $month = 1 , $day =1 $year = 1900, the output is -1, after reading manual, i know its come from something unix epoch limitation (Jan, 1, 1970...), but how to write a custom program or how to calculate the value from mktime?
