optional, TRUE (default) - select component that take place within period FALSE - only components that starts within period
bool
$split
optional, TRUE (default) - one component copy every day it take place during the period (implies flat=FALSE) FALSE - one occurance of component only in output array</tr>
convert input parameters to (valid) iCalcreator date in array format (or FALSE) if $utc=TRUE and $tz = utc offset ([[+/]-]HHmm) input (local) date array + UTC offset returns ouput in UTC format date