🚀 Quick Start

Choose direction: Timestamp → Date or Date → Timestamp
Input: 10 digits = seconds, 13 digits = milliseconds; or enter “2024-01-01 12:00:00” / ISO (e.g. 2024-01-01T12:00:00Z)
Pick unit & timezone: seconds/milliseconds; Local/UTC/major cities
Copy results: multiple common formats with one‑click copy

📌 Common Scenarios

Log tracing: convert timestamps in backend logs to readable date-time to locate issues
Token/session expiry: check JWT exp/iat (issued at) and validate the validity period
DB import/export: convert between timestamps and date fields in SQL/CSV
Frontend display: backend passes seconds/milliseconds; format by the user's timezone on the frontend
Cross-timezone debugging: switch city timezones to observe differences (including DST)
Scheduling: verify triggers match expectations (UTC vs local)
API parameters: validate request/response time units (seconds/ms) and formats
Audit/compliance: convert between ISO and timestamps for manual review

🎛️ Units, Timezones & Formats

Supported formats: ISO 8601, RFC 2822, YYYY‑MM‑DD HH:mm:ss, YYYY/MM/DD HH:mm:ss, HTTP/SQL, etc
Custom format: common templates supported (e.g. YYYY‑MM‑DD HH:mm:ss.SSS)
Auto‑detect: 10‑digit seconds or 13‑digit milliseconds
Timezone: select city timezones, DST handled automatically, with UTC offset

🧭 Usage Advice

Store in UTC, display in user timezone to avoid double conversion
Logs/API debugging: trace timelines, verify token expiry (exp), validate time params
Intervals: for time differences, export results and compute externally
Real‑time: header shows current time and timestamp (milliseconds update)

⚠️ Limitations & Compatibility

Precision: JavaScript Date is millisecond‑precision; use libraries/strings for µs/ns
Leap seconds: not displayed explicitly; most systems align to UTC transparently
Year 2038: 32‑bit Unix time will overflow on 2038‑01‑19 03:14:07 (UTC); prefer 64‑bit timestamps
Input rules: unusual characters are normalized; invalid/ambiguous inputs are flagged

🔒 Privacy & Security

❓ FAQ

What do 10 and 13 digits mean?

10 digits indicate seconds, 13 digits indicate milliseconds. Other lengths are validated accordingly

Why does the time change after switching timezone?

The same absolute moment renders as different local times across timezones (including DST)

Why do ISO and local displays differ?

ISO is standardized; local display depends on locale/timezone—different views of the same instant

How to diagnose parse failures?

Prefer ISO; check spaces/full‑width symbols/timezone offsets; define a custom format if needed