Dates in PDF are specified according to the following format:
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 ’+’, ’-’ or ’Z’;
HH is the absolute value of the offset from UT in hours (00-23);
mm is the absolute value of the offset from UT in minutes (00-59).
A contiguous prefix of the parts above can be used instead, for lower accuracy dates. For example:
D:2014 (2014)
D:20140103 (3rd January 2014)
D:201401031854-08'00' (3rd January 2014, 6:54PM, US Pacific Standard Time)
These are the possible data formats for -set-metadata-date:
YYYY YYYY-MM YYYY-MM-DD YYYY-MM-DDThh:mmTZD YYYY-MM-DDThh:mm:ssTZD
where: