Timestamp Converter
Convert Unix timestamps to dates and dates to timestamps instantly. Supports seconds, milliseconds, microseconds, nanoseconds, UTC, local time, and ISO 8601.
Live Real-Time Epoch Clock Ticker
Auto-updating current Unix timestamp across all precision scales
1788083246
1788083246571
1788083246571000
1788083246571000000
Time Offset Arithmetic Calculator
Click to dynamically adjust the current timestamp forward or backward
Parsed Date & Epoch Inspector
Comprehensive timezone breakdown and formatting outputs
1788083246
1788083246000
1788083246000000 µs
1788083246000000000 ns
Sun, 30 Aug 2026 09:47:26 GMT
1 second ago
2026-08-30T09:47:26.000Z
UTC+00:00 (UTC)
Sun Aug 30 2026 09:47:26 GMT+0000 (Coordinated Universal Time)
Overview
The ToolMono Timestamp Converter & Epoch Platform is a fast time conversion utility designed for software engineers, database administrators, DevOps specialists, data analysts, and security researchers. Epoch time (Unix time) represents the universal heartbeat of computing — measuring the precise number of seconds or milliseconds elapsed since 00:00:00 UTC on January 1, 1970.
Whether you are parsing server log streams, debugging OAuth 2.0 and JWT token expiration claims, executing SQL timestamp queries, or analyzing distributed event metrics across cloud regions, ToolMono provides 100% client-side epoch conversion with live ticker tracking, auto precision detection, manual unit overrides, time offset arithmetic, and multi-line batch processing. For complementary developer workflows, explore our Date Difference Calculator, Age Calculator, JWT Decoder, JSON Formatter, and UUID Generator.
How to Convert a Unix Timestamp
Paste any numeric epoch value (seconds, milliseconds, microseconds, or nanoseconds) or ISO 8601 date string (e.g. 2026-07-26T10:50:00Z) into the input field.
ToolMono automatically detects precision based on length, or you can manually override the unit dropdown (Seconds, Milliseconds, Microseconds, Nanoseconds).
View instant conversions for UTC, Local Time, ISO 8601, and RFC 3339 with one-click copy buttons.
Timestamp Precision: Seconds, Milliseconds, Microseconds & Nanoseconds
Different programming languages and databases express Unix time at varying precision scales:
Seconds (s)
Standard C, POSIX, Python time.time(), Go time.Now().Unix()
Milliseconds (ms)
JavaScript Date.now(), Java System.currentTimeMillis()
Microseconds (µs)
Python time.time_ns() / 1k, C++ chrono, PostgreSQL
Nanoseconds (ns)
Go time.Now().UnixNano(), Linux kernel, Rust Instant
10-Digit and 13-Digit Timestamps
Current-era Unix timestamps measured in seconds are 10 digits long (e.g. 1786147200). POSIX systems, C runtimes, and traditional database columns store timestamps in 10-digit seconds.
Current-era Unix timestamps measured in milliseconds are 13 digits long (e.g. 1786147200000). JavaScript (`Date.now()`), Java, and modern web REST APIs commonly output 13-digit millisecond values.
How Timestamp Conversion Works
All timestamp conversion follows two fundamental paths: a numeric epoch value to a human-readable date, and a human-readable date back to a numeric epoch value.
Timestamp → Date
- 1Receive the numeric value (e.g. 1735689600)
- 2Detect or select the unit: seconds, milliseconds, microseconds, or nanoseconds
- 3Normalize to milliseconds for internal calculation
- 4Calculate the elapsed time from the Unix Epoch (1970-01-01T00:00:00Z)
- 5Express the result as a UTC date and time
- 6Apply the selected timezone offset for local time display
Date → Timestamp
- 1Parse the date string (ISO 8601, RFC 3339, or date picker input)
- 2Identify the timezone (UTC or an explicit offset such as +05:30)
- 3Convert the local time to its UTC equivalent
- 4Calculate the elapsed time since the Unix Epoch
- 5Express the result in the chosen unit (seconds, milliseconds, etc.)
Why the Unix Epoch?
The Unix Epoch (1970-01-01T00:00:00Z) was adopted as the reference point for POSIX-compliant systems. Because the epoch is a fixed UTC instant, a Unix timestamp unambiguously identifies a single point in time regardless of the timezone in which it is read or displayed. Timestamps before 1970 are represented as negative integers.
UTC vs Local Time
Understanding the distinction between UTC (Coordinated Universal Time) and Local Time is critical to preventing timezone bugs:
| Property | UTC Time (Coordinated Universal Time) | Local Time Zone |
|---|---|---|
| Offset Basis | Zero Offset (GMT / UTC+0) | User's Device Offset (e.g. UTC+05:30) |
| Daylight Saving (DST) | Never shifts for DST | Automatically adjusts per region DST rules |
| Primary Use Case | Backend databases, cloud logs, API payloads | Frontend UI display, user calendar rendering |
ISO 8601 and RFC 3339
Both ISO 8601 and RFC 3339 define standardized string formats for exchanging timestamps over HTTP APIs:
Allows multiple variations including basic format (20260726T105000Z) and extended format (2026-07-26T10:50:00.000Z). Adopted by W3C and ECMAScript.
Requires 4-digit years, explicit dashes, colons, and timezone offsets (e.g. 2026-07-26T10:50:00Z or 2026-07-26T16:20:00+05:30). Mandatory for IETF protocols.
Why Timezone Ambiguity Causes Bugs
A date-time string without timezone information is ambiguous. This is one of the most common sources of off-by-hours bugs in APIs, databases, log files, and distributed systems.
Is this UTC? UTC+05:30? UTC−05:00? A parser may guess — and guess wrong.
The trailing Z means UTC. Exactly one instant in time. No ambiguity.
The Same Instant, Different Clock Readings
A Unix timestamp represents the same instant everywhere on Earth. Only the displayed clock time differs by timezone:
| Timezone | Offset | Displayed Time |
|---|---|---|
| UTC | ±00:00 | 2025-07-01 10:30:00 |
| India Standard Time | +05:30 | 2025-07-01 16:00:00 |
| Eastern Time (US) | −04:00 | 2025-07-01 06:30:00 |
| Japan Standard Time | +09:00 | 2025-07-01 19:30:00 |
The Unix timestamp is identical for all rows. Only the rendering changes. This is why Unix timestamps are timezone-agnostic by design.
Common Timestamp Conversion Use Cases
Convert JSON response timestamps or JWT expiration claims (exp, iat) into human-readable dates to verify token validity.
Convert raw epoch timestamps in application logs, Nginx access logs, or CloudWatch streams to troubleshoot incident timelines.
Inspect epoch integer columns stored in PostgreSQL, MySQL, SQLite, or MongoDB databases without writing SQL conversion functions.
Convert `Date.now()` values or test date boundaries when building UI date pickers and countdown timers.
Debugging Common Timestamp Problems
Timestamp bugs follow recognizable patterns. Here are the most frequent problems and their likely causes.
“My timestamp shows a date in 1970”
Likely cause: A seconds timestamp is being treated as milliseconds. Passing 1735689600 (seconds) to JavaScript's new Date() — which expects milliseconds — produces a date in January 1970, not 2025.
Fix: Multiply seconds by 1,000 before passing to Date(): new Date(timestamp * 1000). Or use ToolMono to confirm the correct unit.
“My result is several hours off”
Likely cause: A timezone offset mismatch. The timestamp is correct but the display timezone doesn't match expectations, or a date was stored in local time and interpreted as UTC (or vice versa).
Fix: Always store and transfer timestamps in UTC. Apply the timezone offset only when displaying the date to the end user.
“My timestamp value is extremely large (19+ digits)”
Likely cause: The value is in nanoseconds, not seconds or milliseconds. A nanosecond timestamp is approximately 1,000,000,000× larger than the equivalent seconds value.
Fix: Divide by 1,000,000,000 to convert nanoseconds to seconds. ToolMono auto-detects the unit from digit count and handles this automatically.
“Different systems return different values for the same event”
Likely cause: Different runtimes use different default units: JavaScript returns milliseconds, Python returns seconds (float), Go returns seconds or nanoseconds depending on the call.
Fix: Normalize all timestamps to a single unit (typically seconds or milliseconds) at the boundary where data enters your system.
Timestamp Unit Scale Reference
Every timestamp format represents the same instant — the number grows proportionally larger with each finer unit of precision.
| Unit | Digits | Scale (vs seconds) | Example Value | Common Sources |
|---|---|---|---|---|
| Seconds | 10 | 1 | 1735689600 | POSIX C, Python time.time(), Go Unix(), SQL |
| Milliseconds | 13 | 1,000 | 1735689600000 | JavaScript Date.now(), Java, REST APIs |
| Microseconds | 16 | 1,000,000 | 1735689600000000 | PostgreSQL, C++ chrono, Python time_ns() |
| Nanoseconds | 19 | 1,000,000,000 | 1735689600000000000 | Go UnixNano(), Rust Instant, Linux kernel |
Converting Between Units
| From | To | Operation |
|---|---|---|
| Seconds | Milliseconds | × 1,000 |
| Milliseconds | Seconds | ÷ 1,000 |
| Microseconds | Milliseconds | ÷ 1,000 |
| Nanoseconds | Seconds | ÷ 1,000,000,000 |
Frequently Asked Questions
References & Standards
ISO 8601-1:2019 Date and Time Representation Standard
Official international ISO standard for interchange of date and time data.
RFC 3339: Date and Time on the Internet (Timestamps)
Official IETF Internet profile for ISO 8601 timestamps.
IANA Time Zone Database Specifications
Authoritative global time zone shapes, offsets, and daylight savings transitions.
MDN Web Docs: JavaScript Date Object
Mozilla documentation for Epoch millisecond conversion.
Related Tools
Browse all toolsDate Difference Calculator
Free online Date Difference Calculator. Calculate days between dates, business days, weeks, months, years, and working hours with interactive timeline.
Age Calculator
Free online Age Calculator. Calculate exact chronological age in years, months, days, weeks, hours, minutes, seconds, zodiac signs, and next birthday.
JWT Decoder Online
Decode JWT tokens instantly in your browser. Inspect headers, payload claims, verify signatures, convert timestamps, and debug JWTs securely with 100% client-side processing.
Online JWT Generator & Token Signer
Build and sign JSON Web Tokens online for API testing and development. Customize JWT claims and generate signed tokens directly in your browser with 100% client-side processing.
JSON Formatter
Free online JSON formatter, beautifier, and validator. Format, indent, minify, and inspect JSON with real-time syntax error detection in your browser. 100% client-side.
Online UUID & GUID Generator
Generate secure UUID v4 and time-ordered UUID v7 identifiers online. Create single or bulk UUIDs with formatting controls, GUID support, and client-side Web Crypto generation.
Hash Generator
Generate hashes and file checksums locally in your browser. Compare digests, copy results, and use MD5, SHA-1, SHA-2, SHA-3, BLAKE2, and supported HMAC algorithms.