leap-seconds.list.do |  1 +
 leapsecs.dat.do      |  2 ++
 leapsecs.txt         | 27 +++++++++++++++++++++++++++

diff --git a/leap-seconds.list.do b/leap-seconds.list.do
new file mode 100644
index 0000000000000000000000000000000000000000..8404247d12bfa39182ca06483f3139a4491d324f176d52e17ba4c648c5e154f3
--- /dev/null
+++ b/leap-seconds.list.do
@@ -0,0 +1 @@
+wget -O $3 https://www.ietf.org/timezones/data/leap-seconds.list
diff --git a/leapsecs.dat.do b/leapsecs.dat.do
new file mode 100644
index 0000000000000000000000000000000000000000..cee2ae2c1c6efa852a520d187d88e399ad655de0bfb0e0839c7f85c7cc78f468
--- /dev/null
+++ b/leapsecs.dat.do
@@ -0,0 +1,2 @@
+redo-ifchange leapsecs.txt
+leapsecs < leapsecs.txt
diff --git a/leapsecs.txt b/leapsecs.txt
new file mode 100644
index 0000000000000000000000000000000000000000..d9e35977c19b6a7b00bda4165e6955359c47c85aa7a305ba57173f4e9d5f5737
--- /dev/null
+++ b/leapsecs.txt
@@ -0,0 +1,27 @@
++1972-06-30
++1972-12-31
++1973-12-31
++1974-12-31
++1975-12-31
++1976-12-31
++1977-12-31
++1978-12-31
++1979-12-31
++1981-06-30
++1982-06-30
++1983-06-30
++1985-06-30
++1987-12-31
++1989-12-31
++1990-12-31
++1992-06-30
++1993-06-30
++1994-06-30
++1995-12-31
++1997-06-30
++1998-12-31
++2005-12-31
++2008-12-31
++2012-06-30
++2015-06-30
++2016-12-31