function PdfDateToDateTime(PdfDate: string): TDateTime;
Description
Converts a PDF date string to a TDateTime value.
PDF dates are formatted as:
D:YYYYMMDDHHmmSSOHH'mm'
Where:
YYYY is the year
MM is the month
DD is the day (01-31)
HH is the hour (00-23)
mm is the minute (00-59)
SS is the second (00-59)
O is the relationship of local time to Universal Time (UT), denoted by one of the characters +, -, or Z (see below)
HH followed by ' is the absolute value of the offset from UT in hours (00-23)
mm followed by ' is the absolute value of the offset from UT in minutes (00-59)