ISO-8601
ISO-8601 is an international standard for the representation of dates and times, established by the International-Organization-for-Standardization. It provides a consistent and unambiguous method for representing temporal data, which is crucial for Computing and Data-interchange. The standard is based on the Gregorian-calendar and utilizes a big-endian format, meaning it progresses from the largest unit of time to the smallest.
The most frequently used format is the calendar date, written as YYYY-MM-DD. When time is included, it is typically separated from the date by the character 'T', and Coordinated-Universal-Time is indicated by the suffix 'Z'. This structure is widely adopted in Network-protocols and API-design because it is lexicographical and prevents confusion between different regional date formats. You can find more information on the official ISO website and the Wikipedia page for ISO 8601.