Last Updated：2025/11/28
(chiefly US military slang) Half an hour past 12(am) midnight, or more formal and exact would be 00:30; The practice of adding “dark” and “thirty” (30) can be used sometimes as a slang term in place of an otherwise specific time a time of night, meaning some time when it is dark out between 00:01 - 05:00 hours local time.
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0-dark-thirty
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Source Word
0-dark-thirty
Noun
US
slang
uncountable
(chiefly
US
military
slang)
Half
an
hour
past
12(am)
midnight,
or
more
formal
and
exact
would
be
00:30;
The
practice
of
adding
“dark”
and
“thirty”
(30)
can
be
used
sometimes
as
a
slang
term
in
place
of
an
otherwise
specific
time
a
time
of
night,
meaning
some
time
when
it
is
dark
out
between
00:01
-
05:00
hours
local
time.
Japanese Meaning
（米軍の俗語）午前0時半、すなわち00:30を示す。 / （米軍の俗語として）特定の正確な時刻の代わりに、夜の暗い時間帯（00:01～05:00の間）を指す表現として用いられる。
Sense（1）
(chiefly
US
military
slang)
Half
an
hour
past
12(am)
midnight,
or
more
formal
and
exact
would
be
00:30;
The
practice
of
adding
“dark”
and
“thirty”
(30)
can
be
used
sometimes
as
a
slang
term
in
place
of
an
otherwise
specific
time
a
time
of
night,
meaning
some
time
when
it
is
dark
out
between
00:01
-
05:00
hours
local
time.
