<s>
PDB	B-Application
is	O
a	O
container	O
format	O
for	O
record	O
databases	O
in	O
Palm	B-Operating_System
OS	I-Operating_System
,	O
Garnet	B-Operating_System
OS	I-Operating_System
and	O
Access	B-Language
Linux	I-Language
Platform	I-Language
.	O
</s>
<s>
Its	O
structure	O
is	O
similar	O
to	O
PRC	B-Application
resource	O
databases	O
.	O
</s>
<s>
The	O
PalmDOC	O
eBook	O
format	O
is	O
a	O
special	O
version	O
of	O
the	O
PDB	B-Application
format	O
.	O
</s>
<s>
A	O
PDB	B-Application
file	O
contains	O
a	O
PDB	B-Application
header	O
,	O
PDB	B-Application
record	O
headers	O
and	O
records	O
.	O
</s>
<s>
The	O
PDB	B-Application
header	O
is	O
located	O
at	O
the	O
beginning	O
of	O
the	O
file	O
and	O
contains	O
meta-information	O
on	O
the	O
file	O
:	O
</s>
<s>
Many	O
PDB	B-Application
format	O
files	O
used	O
times	O
counting	O
in	O
seconds	O
from	O
1904-01-01T00:00:00	O
.	O
</s>
<s>
It	O
may	O
be	O
noted	O
that	O
there	O
were	O
close	O
links	O
between	O
Palm	B-Operating_System
OS	I-Operating_System
and	O
Mac	O
OS	O
during	O
early	O
development	O
.	O
</s>
<s>
This	O
conflict	O
between	O
old	O
Palm	O
(	O
Mac	O
OS	O
9	O
)	O
epoch	O
and	O
UNIX	O
epoch	O
is	O
unfortunate	O
,	O
the	O
following	O
heuristic	O
may	O
be	O
useful	O
when	O
examining	O
a	O
file	O
copied	O
from	O
a	O
Palm	B-Operating_System
OS	I-Operating_System
device	O
:	O
</s>
<s>
This	O
is	O
based	O
on	O
the	O
idea	O
that	O
,	O
otherwise	O
the	O
time	O
would	O
be	O
before	O
1972	O
or	O
before	O
1970	O
(	O
depending	O
on	O
the	O
interpretation	O
)	O
and	O
the	O
PDB	B-Application
format	O
was	O
n't	O
around	O
then	O
.	O
</s>
