TCalc.it
The calculator that actually understands time
TCalc.it launched on July 20, 2026 with 4 votes, #6,023 of 24,623 launches that month and more than 75% of that year's launches.
What it does
TCalc.it parses almost any time format — just type how you think about time: "2h 30m + 45m" → 3h 15m · "14:30 to 16:45" → 2h 15m · "22:00 to 6:00" → 8h (overnight) · "NOW + 90d" → deadline date · "01:00:00:12f24" → SMPTE timecode · "1737100000UNIX" → readable date. Type-safe: knows durations vs dates, so you never get nonsense. 15+ formats: decimal hours, FPS timecodes, ISO 8601. 6 modes for HR, film, dev, logistics & accounting. PWA with cloud sync. Android out now, iOS soon.
A calculator that understands time. Add and subtract hours, minutes and dates, convert to decimal hours, timecode or timestamps - type it the way you say it.
Every one of these breaks a normal calculator in a different way. When the film ends, how old you are in days, how long until a date. 20:15 + 2h18m. Shifts across midnight, unpaid breaks, decimal hours for payroll. 22:00 to 06:30 - 30m. SMPTE timecode as a real value, frames and all. 01:23:45:12f24 + 250f. Epoch seconds, sprint dates, milliseconds. 1755000000 + 14d, out as ISO 8601. Billable time into man-days and FTE without a spreadsheet. 37h 15m / 8h. Driving blocks, mandatory breaks, what is left of the day. 9h - 4h30m - 45m. A duration added to a clock time gives a time of day. Two dates subtracted give a span. Adding two dates is refused, because it means nothing. Compact time,…from tcalc.it
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UTC Time - live clock, ISO 8601, Unix timestampAug 2026 · utctime.app · ▲26Live UTC clock with one-click copy for ISO 8601, RFC 3339, RFC 2822 and Unix time, a device clock-skew check, and get-the-time-now code for 14 languages. Dark, fast, no signup.
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I find myself having to convert a lot of unix timestamps to a human readable format, but most of the online calculators I found don't include the micro or nanoseconds in the human readable output. It's a small detail, but I find myself having to manually space out the timestamp frequently. I'm learning frontend development, so I made this converter to hopefully make it easier to convert timestamps. Welcome to any feedback :)
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