Osaka and Tokyo share the same timezone year-round. When it's 12:00 PM in Tokyo, it's also 12:00 PM in Osaka. Japan does not observe DST.
All of Japan uses Japan Standard Time (JST, UTC+9) regardless of location. The entire country operates on a single timezone.
Any time works! Business hours are identical. The Shinkansen connects the two cities in about 2.5 hours, making same-day business trips common.
Osaka is Japan's second-largest metropolitan area and commercial hub. While Tokyo is the capital, Osaka is known as Japan's kitchen and is a major business center especially for manufacturing and commerce.