Date APIs

Discover the best list of relevant free and premium date APIs.

About this Collection:

Date API

About Date APIs

Time and dates are essential in an individual’s life, a company, and even a country. These two help us to schedule events and plan for success.
Date APIs and time APIs are a group of packages that capture crucial data that revolves around time and dates.

How date APIs works

These APIs utilize JSON data format. However, JSON does not have native DateTime and data like most databases; hence, the date storage is in a JSON string or a JSON number.

There are specific formats that one needs to follow. The data string should have the ISO 8601 format, and the date numbers’ storage should be in Unix Epoch time. While keeping the date numbers, it is crucial to ensure that the API specifies seconds and milliseconds.

Some APIs will default the absence of timezone information as UTC. For the API to work effectively and consistently, you need to have the HTTP response payload in UTC (Universal time coordinate). The API should also adhere to robustness principles, which outlines that you should be conservative in your art while liberally accepting what others do.

While a Time API might fail to fulfill the required absence of timezone data as a UTC, the Date API should parse a given timezone in an HTTP request or a URL parameter without a UTC.


Developers - The data available in the date API provides a foundation for website and application developers. Some front end clients who include mobile and single page applications need the APIs which contain DateTime fields to enhance backend communication.

Airline companies - The airline industry heavily relies on time and dates to do business. They use the APIs to understand the different timezones through which the airplanes will navigate, and this process helps them schedule flights and serve their clients better.

Governments - Different governments have different events and meetings to do every year. Fundamental processes such as budgeting and national holidays and payment of civil workers need to have timelines. Governments use the APIs to ensure that they create an annual calendar that captures all their activities.


  • Easy to compute dates in the future or the past from a referenced date.
  • Help in the automation of activities
  • Provide reliable information about particular dates.


In the past, the existing date APIs have been mulled by multiple flaws. There is a need to improve the APIs and have accurate data. Free examples include World Clock, Calendar, and Alarm APIs.

Best Date APIs

  1. World Clock
  2. Calendar
  3. Alarm Clock as a Service


All Date APIs are supported and made available in multiple developer programming languages and SDKs including:

  1. Node.js
  2. PHP
  3. Python
  4. Ruby
  5. Objective-C
  6. Java (Android)
  7. C# (.NET)
  8. cURL

Just select your preference from any API endpoints page.

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