TimeSpanCalc - Free date calculator — no ads, no account, just answers.

Hey Product Hunt 👋 I'm Chaofan — full-stack dev and AI trainer based in Montreal. TimeSpanCalc started as a personal frustration. Every date calculator I found was either buried in ads, required an account, or made me scroll past three banners just to see my result. So I built the one I actually wanted to use. The design philosophy is Bauhaus — form follows function entirely. No gradients, no decorative elements, nothing that doesn't earn its place. Just a precise tool that gets out of your way. What it does: → Days between any two dates → Add or subtract time from a date → Count down to any future event → Look up what day of the week any date falls on → Generate a recurring date schedule at any interval That last one — the recurring schedule generator — is the feature I haven't seen done well anywhere else. If you track medication, rent, paydays, visa renewals, or any repeating date pattern, try it. Would love to hear what use case brings you here. What date are you trying to figure out? 🗓