diff --git a/packages/ts-utils/src/time.ts b/packages/ts-utils/src/time.ts
index d748fd6..ceb2cf9 100644
--- a/packages/ts-utils/src/time.ts
+++ b/packages/ts-utils/src/time.ts
@@ -2,6 +2,8 @@ export const SECONDS = 1000;
 export const MINUTES = 60 * SECONDS;
 export const HOURS = 60 * MINUTES;
 export const DAYS = 24 * HOURS;
+export const WEEKS = 7 * DAYS;
+export const MONTHS = 30 * DAYS;
 export const YEARS = 365.25 * DAYS;
 
 export interface Timespan {
diff --git a/src/time.ts b/src/time.ts
index 2e9a538..82f3086 100644
--- a/src/time.ts
+++ b/src/time.ts
@@ -2,6 +2,8 @@ export const SECONDS = 1000;
 export const MINUTES = 60 * SECONDS;
 export const HOURS = 60 * MINUTES;
 export const DAYS = 24 * HOURS;
+export const WEEKS = 7 * DAYS;
+export const MONTHS = 30 * DAYS;
 export const YEARS = 365.25 * DAYS;
 
 export interface Timespan {