UNIX Timestamp Converter Online
Convert UNIX epoch timestamps to human-readable dates and format date strings into timestamps.
Quick Answer & Understanding Your Result
A UNIX T×tamp (Epoch Time) represents the number of seconds (or milliseconds) that have elapsed since 00:00:00 UTC on January 1, 1970, ignoring leap seconds.
Standard Epoch Time Units
- Seconds T×tamp (10 Digits): Standard UNIX / POSIX format (e.g.
1787980000). - Milliseconds T×tamp (13 Digits): JavaScript and Java time format (
Date.now()approx1787980000000). - Microseconds / Nanoseconds (16–19 Digits): High-resolution telemetry and database t×tamps (Go, Python
time_ns()).
Universal Conversions Supported
- T×tamp to Date: Converts integer seconds/milliseconds to ISO 8601, RFC 2822, UTC, and Local Time.
- Date to T×tamp: Converts human calendar inputs into exact epoch seconds and milliseconds.
Paste an epoch integer or pick a date above to inspect converted timezones and live countdown clocks.
Formula & Calculation Logic
Technical Specification & ASTComputes elapsed SI seconds since the POSIX epoch baseline of 1970-01-01T00:00:00Z.
Step-by-Step Guide
Enter Timestamp or Date
Input 10-digit/13-digit integer or pick calendar date.
Select Timezone
View converted results in UTC, GMT, or your local timezone.
Copy Formatted Output
Copy ISO 8601, RFC 2822, or SQL DATETIME formats.
Worked Examples Table
| Example | Input Values | Calculated Result | Explanation |
|---|---|---|---|
| Convert Epoch 1700000000 | Translates 10-digit epoch seconds into exact calendar date and time. | ||
| Mid-Year 2026 Benchmark | Provides instant quantitative evaluation for comparative practical analysis. |
Frequently Asked Questions
Evidence-Based Methodology & Authoritative References
IEEE Std 1003.1 (POSIX) - General Concepts: Epoch
Standard: ISO / W3C / IETF Authoritative Domain Standard
Formula: Epoch Seconds = Math.floor(Date.now() / 1000)
Last Reviewed: August 21, 2026
Primary Source: IEEE Std 1003.1 (POSIX) - General Concepts: Epoch
Reference Document: Domain Standards & Specifications
Computation Privacy: 100% client-side 0ms computation, zero data retention
All algorithms, formatters, and data conversions run 100% locally in your browser following official technical standards (RFC, ISO, W3C). Output should be verified prior to mission-critical production deployment.
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Calculated results are modeled based on standard scientific and mathematical formulas. Please verify with domain-specific technical documentation for specialized applications.