+.SS "DateStamper time stamps" \"{{{
+The DateStamper software added functions to the BDOS to manage
+time stamps by allocating a read only file with the name "!!!TIME&.DAT"
+in the very first directory entry, covering the very first data
+blocks. It contains one entry per directory entry with the
+following structure of 16 bytes:
+.RS
+.sp
+5 bytes create datefield
+.br
+5 bytes access datefield
+.br
+5 bytes modify datefield
+.br
+1 byte checksum
+.sp
+.RE
+The checksum is only used on every 8th entry (last entry in 128-byte
+record) and is the sum of the first 127 bytes of the record.
+Each datefield has this structure:
+.RS
+.sp
+1 byte BCD coded year (no century, so it is sane assuming any year < 70
+means 21st century)
+.br
+1 byte BCD coded month
+.br
+1 byte BCD coded day
+.br
+1 byte BCD coded hour or, if the high bit is set, the high byte of a
+counter for systems without real time clock
+.br
+1 byte BCD coded minute, or the low byte of the counter
+.sp
+.DE
+.\"}}}