Pal Singh Purewal, Punjabi engineer, author, scholar, and teacher (born 1931/1932)

Pal Singh Purewal was a Punjabi engineer, author, scholar and a teacher. He was commonly known as the architect of the Mool Nanakshahi Calendar. He was also known as a role model in the Sikh community. He emigrated to the United Kingdom in 1965 and worked as a senior engineer at Texas Instruments. He moved to Canada in 1974. He has authored various research papers establishing the authenticity of the Sikh calendar since 1960s. His published texts include:

• Jantri 500 YEARS - An Almanac, published by Punjab School Education Board in November 1994
• Hijri Calendar - A book for which he received "lifetime achievement" award

September 22 is the 265th day of the year in the Gregorian calendar; 100 days remain until the end of the year.