diff --git a/types/ontime/index.d.ts b/types/ontime/index.d.ts
new file mode 100644
index 0000000000..6af9872e06
--- /dev/null
+++ b/types/ontime/index.d.ts
@@ -0,0 +1,83 @@
+// Type definitions for ontime 0.0
+// Project: http://code.woong.org/ontime
+// Definitions by: Jan Pilzer <https://github.com/Hirse>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+export interface OntimeSchedule {
+    /**
+     * ontime determines the cycle of a job based on the format of time expressions. The time expression basically has
+     * the form of an ISO-8601 Date Format, YYYY-MM-DDThh:mm:ss where YYYY indicates a year, MM a month, DD a day of the
+     * month, hh an hour, mm a minute and ss a second, except that:
+     *
+     * * A unit can be omitted only when units greater than that are also omitted, which means the day part(DD) cannot be
+     * omitted unless the year and month parts(YYYY-MM-) are. This makes ontime's time expression differ from the
+     * original ISO-8601 format because the later allows smaller units to be omitted in times. For example, 12 and 12:00
+     * denote hh and hh:mm respectively in the ISO-8601 format while ss and mm:ss respectively in the ontime's format;
+     * * A space can be used to separate the time part from the date part instead of T as in 2010-01-09 11:00:00;
+     * * and ontime allows digits not to be zero-padded; for example, it accepts 2014-5-4T0:0:0 as well as
+     * 2014-05-04T00:00:00
+     *
+     * The time expression is given to ontime through the cycle option. You can give a single expression of the string
+     * type like '01-01T12:00:00' or multiple ones as an array of strings like [ '01-01T12:00:00', '7-1T0:0:0' ]
+     */
+    cycle: string | string[];
+
+    /**
+     * It is sometimes necessary to run a job on the last day of each month, which have been replaced with doing it on
+     * the first day of each month instead. By setting the keepLast option to true, ontime automatically adjusts the
+     * date part(DD) to the last day according to the value of the month part(MM) if necessary.
+     *
+     * Default: false
+     */
+    keepLast?: boolean;
+
+    /**
+     * The step option enables a job to be skipped periodically.Setting it to n forces ontime to skip a given job n-1
+     * times after a run, which leads to launching the job eveny n cycles.
+     *
+     * Default: 1
+     */
+    step?: number;
+
+    /**
+     * Setting the utc option to true changes ontime to interpret the time expressions as UTC.
+     *
+     * Default: false
+     */
+    utc?: boolean;
+
+    /**
+     * ontime launches a job on its scheduled time. If the job takes longer than the time interval of the cycle, more
+     * than one instance of the job may run at the same time. The single option keeps another instance of a job from
+     * starting if there is already a running one.
+     *
+     * Default: false
+     */
+    single?: boolean;
+
+    /**
+     * ontime has a very simple form of logging that is useful when checking if your configuration works as intended.
+     * It can be turned on by setting the log option to true.
+     *
+     * Default: false
+     */
+    log?: boolean;
+}
+
+export interface OntimeReport {
+    /**
+     * Should be called after the job has been finished.
+     * This is important especially when single is set to true because scheduling the next run is done in the method.
+     */
+    done(): void;
+
+    /**
+     * Clears timers for scheduling jobs that the ontime instance knows.
+     * This does not terminate the current execution of a job; you still need to call ot.done() for that purpose.
+     */
+    cancel(): void;
+}
+
+export type OntimeJob = (ot: OntimeReport) => void;
+
+export function ontime(sched: OntimeSchedule, job: OntimeJob): void;
diff --git a/types/ontime/ontime-tests.ts b/types/ontime/ontime-tests.ts
new file mode 100644
index 0000000000..4b9db88973
--- /dev/null
+++ b/types/ontime/ontime-tests.ts
@@ -0,0 +1,37 @@
+import { ontime } from "ontime";
+
+ontime({
+    cycle: ['04:30:00', '9:00:00']
+}, (ot) => {
+    ot.done();
+});
+
+ontime({
+    cycle: '2-9T00:00:00'
+}, (ot) => {
+    ot.done();
+});
+
+ontime({
+    cycle: '31T00:00:00',
+    keepLast: true,
+    step: 3
+}, (ot) => {
+    ot.done();
+});
+
+ontime({
+    cycle: '31T00:00:00',
+    single: false
+}, (ot) => {
+    ot.cancel();
+    ot.done();
+});
+
+ontime({
+    cycle: '31T00:00:00',
+    utc: true,
+    log: true
+}, (ot) => {
+    ot.done();
+});
diff --git a/types/ontime/tsconfig.json b/types/ontime/tsconfig.json
new file mode 100644
index 0000000000..fd10fa5e88
--- /dev/null
+++ b/types/ontime/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true,
+        "strictFunctionTypes": true
+    },
+    "files": [
+        "index.d.ts",
+        "ontime-tests.ts"
+    ]
+}
diff --git a/types/ontime/tslint.json b/types/ontime/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/ontime/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }