There are many alternative dating systems used in different cultures and regions, each with its own unique way of numbering years. Here are a few examples:

1. BCE/CE (Before Common Era/Common Era): This system is a secular alternative to the traditional BC/AD system. It maintains the same reference point as BC/AD, but replaces "Before Christ" with "Before Common Era" and "Anno Domini" with "Common Era." The BCE/CE system is used to provide a neutral and inclusive dating method that doesn't have religious connotations.

2. Islamic Calendar (Hijri Calendar): The Islamic calendar is a lunar calendar used primarily in Muslim countries. It dates from the year of the migration (Hijra) of the Prophet Muhammad from Mecca to Medina in 622 AD. The years are designated as AH (Anno Hegirae) and are counted strictly based on lunar months.

3. Hebrew Calendar: The Hebrew calendar is a lunisolar calendar used in Jewish communities. It counts years from the traditional date of the creation of the world, as calculated in Jewish tradition. The years are designated AM (Anno Mundi, "Year of the World").

4. Chinese Calendar: The traditional Chinese calendar is a lunisolar calendar used in China and other East Asian countries. It designates years using a combination of heavenly stems and earthly branches, along with a cycle of 60 years. Each year is associated with one of the twelve zodiac animals.

5. Buddhist Calendar: The Buddhist calendar is used in various Buddhist countries and is based on the traditional date of the Buddha's parinirvana (passing away) in 543 or 544 BC. It is primarily used for religious and cultural purposes.

6. Japanese Era Names: Japan uses the Gregorian calendar for most purposes, but it also has a system of era names. Each era corresponds to the reign of a specific emperor, and the year changes with the start of a new emperor's reign. For example, the current era in Japan is "Reiwa," which began on May 1, 2019, with the enthronement of Emperor Naruhito.

These alternative dating systems differ from the BC/AD system in their reference points, their cultural and religious significance, and their method of numbering years. Each system reflects the unique history, beliefs, and traditions of the respective cultures and regions in which they are used.
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