TimeSpanCalc is a free date and duration calculator built for people who need real answers fast. Calculate the exact days between two dates, add or subtract time from any date, count down to a future event, look up what day of the week any date falls on, or generate a recurring date schedule at any interval. No ads. No account. No clutter. Bauhaus design — every element earns its place. Works on any device.
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? 🗓
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