Date difference calculator
Find the number of calendar days and weeks between two dates.
CalculatorsUnix timestamp converter
Convert Unix seconds or milliseconds to a date, or an ISO date to a timestamp.
Ready when you are.
◎ No uploads. Your input stays here.↗ Free to use. No account needed.⌘ / Ctrl + Enter to run
A worked example
Unix seconds converted to UTC. The additional local-time line depends on your browser timezone.
Input / settings
1704067200
Expected result
UTC: 2024-01-01T00:00:00.000Z Unix seconds: 1704067200 Unix milliseconds: 1704067200000
A LITTLE GUIDANCE
How to use Unix timestamp converter
Choose the input type. ISO dates should include Z or an explicit timezone offset; results include UTC and Unix values.
Good to know
Unix timestamps count from 1970-01-01T00:00:00Z. Leap seconds are not represented.
A few quick answers.
Why does my date look like 1970?
You may have selected milliseconds for a seconds value. Choose the matching unit. ISO input must include Z or an explicit timezone offset.
Is my input sent to a server?
No. This tool processes your input in your browser. We don't store your text, files or results. Standard website access logs are separate; read our privacy notes.
Can I use it for free?
Yes. No account, subscription or usage credits are required.
How do I keep my result?
Use Copy or Download after running the tool. Inputs are not saved automatically and disappear when you leave or refresh the page.
Something not right? Report a problem with this tool. Include the steps, but never passwords or private input.