Where these windows come from
These are generic, widely-cited best-practice posting windows based on each platform's general audience behavior patterns - not personalized data pulled from your specific account or audience. The tool converts the listed UTC-based windows into your local time based on the timezone offset you choose.
Why checking your own analytics should take priority over these general windows
Your own audience's actual active hours can differ meaningfully from these general patterns, especially if your followers are concentrated in a specific region or timezone. Check your own platform analytics (most platforms show you exactly when your followers are online) for a more accurate, personalized answer once you have an established audience to measure.
Why each platform gets a noticeably different suggested window
TikTok's suggested windows lean toward early morning and late evening, while LinkedIn's cluster around standard working hours - reflecting genuinely different typical usage patterns for a short-form entertainment app browsed on personal time versus a professional network browsed mostly during the workday, which is why picking the right platform in the dropdown matters, not just the right time.
Why the tool asks for your timezone offset rather than detecting it automatically
Letting you pick the offset explicitly means the suggested windows work correctly even if you're scheduling posts for an audience in a different timezone than the one your own device is set to - useful if you manage a brand or account whose audience is based somewhere else.