feat: add isValidGermanDate and isValidTime (german date and time val…

…idation)
Ralf77 · Feb 5, 2024 · b6b7ad5 · b6b7ad5
1 parent 90e1471
commit b6b7ad5
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diff --git a/src/date.test.ts b/src/date.test.ts
@@ -6,6 +6,7 @@ import {
   formatGermanFullDateTime,
   isFuture,
   isToday,
+  isValidGermanDate,
   parseGermanDate,
   parseGermanDateFlexible,
   parseIsoDate,
@@ -63,6 +64,35 @@ describe('formatGermanDateTime', () => {
   });
 });
 
+describe('isValidGermanDate', () => {
+  it('should determine if a string matches the german date format dd.mm.yyyy', () => {
+    expect(isValidGermanDate('01.01.2000')).toEqual(true);
+    expect(isValidGermanDate('1.1.2000')).toEqual(true);
+    expect(isValidGermanDate('1.01.2000')).toEqual(true);
+    expect(isValidGermanDate('01.1.2000')).toEqual(true);
+    expect(isValidGermanDate('011.1.2000')).toEqual(false);
+    expect(isValidGermanDate('01.111.2000')).toEqual(false);
+    expect(isValidGermanDate('01.01.200')).toEqual(false);
+    expect(isValidGermanDate('xx.01.2000')).toEqual(false);
+    expect(isValidGermanDate('01.yy.2000')).toEqual(false);
+    expect(isValidGermanDate('01.01.zzzz')).toEqual(false);
+    expect(isValidGermanDate('')).toEqual(false);
+    expect(isValidGermanDate('..')).toEqual(false);
+    expect(isValidGermanDate('abc')).toEqual(false);
+  });
+});
+
+describe('isValidTime', () => {
+  it('should determine if a string matches the time format HH:mm', () => {
+    expect(isValidGermanDate('12:55')).toEqual(true);
+    expect(isValidGermanDate('1:55')).toEqual(false);
+    expect(isValidGermanDate('12:5')).toEqual(false);
+    expect(isValidGermanDate('')).toEqual(false);
+    expect(isValidGermanDate(':')).toEqual(false);
+    expect(isValidGermanDate('abc')).toEqual(false);
+  });
+});
+
 describe('isToday', () => {
   it('should determine if a date is today', () => {
     expect(isToday(new Date())).toEqual(true);

diff --git a/src/date.ts b/src/date.ts
@@ -15,6 +15,27 @@ export function isFuture(date: Date | string | number): boolean {
   return isAfter(date, new Date());
 }
 
+export function isValidGermanDate(date: string): boolean {
+  const regexGermanDateFormat = /^(\d{1,2}[.]\d{1,2}[.]\d{4})$/;
+
+  if (date.match(regexGermanDateFormat)) {
+    return true;
+  }
+
+  return false;
+}
+
+export function isValidTime(time: string): boolean {
+  const regexTimeFormat = /^(\d{2}[:]\d{2})$/;
+
+  if (time.match(regexTimeFormat)) {
+    return true;
+  }
+
+  return false;
+}
+
+
 export function parseDate(value: string, formatString: string): Date | null {
   const parsedDate = parse(value, formatString, new Date());