There are two Yokohama postmarks on this card. One in Japanese (over the stamp) and one in English. Japanese postmarks have the date in the Year-month-day format. And English postmarks have it in the Day-month-Western year format. As you may know, Japan bases its years on the Emperor's reign. In the Japanese postmark, you can see "36" for the year. That's not 1936, but Meiji 36 that corresponds to 1903. Besides the Meiji Period (1868-1912), there's the Taisho Period (1912-1926) and the Showa Period (1926-1989). Since the Japanese postmark only indicates the last two digits of the year, it can be a pain to figure out which period the year belongs to. In most cases, we can figure it out with the stamp or type of postcard back.

The actual card is more yellowed and almost brown, but I bleached it with Photoshop.