Unix Timestamp & Epoch Converter
Convert between Unix timestamps and human-readable dates in seconds, milliseconds, microseconds, and nanoseconds across any global timezone.
Executive Summary: Unix Timestamp & Epoch Converter
Direct AnswerWhat is OperateTools Unix Timestamp & Epoch Converter? OperateTools Unix Timestamp Converter is a high-performance, browser-native utility engineered to convert integer Unix POSIX timestamps (measured in seconds, milliseconds, microseconds, or nanoseconds) into human-readable calendar dates across all global timezones, and format human dates back into epoch timestamps without transmitting data to external servers.
Timestamp → Human Date
Auto DetectHuman Date → Timestamp
Real-Time GeneratorBatch Unix Timestamp Converter
Convert multiple timestamps at once with instant tabular output and CSV export.
Date Epoch Boundaries Generator
Compute precise start (00:00:00) and end (23:59:59) Unix epoch timestamps for Year, Month, Day, and Week.
Common Reference Unix Timestamps
Key milestone timestamps, century boundaries, and architecture limitations.
| Milestone / Event | Unix Timestamp (s) | Date & Time (UTC) | Notes |
|---|---|---|---|
| Unix Epoch (Start of Time) | 0 | 1970-01-01 00:00:00 | Epoch Zero |
| Year 2000 (Y2K) | 946684800 | 2000-01-01 00:00:00 | Millennium threshold |
| Year 2024 Start | 1704067200 | 2024-01-01 00:00:00 | Past milestone |
| Year 2025 Start | 1735689600 | 2025-01-01 00:00:00 | Past milestone |
| Year 2026 Start | 1767225600 | 2026-01-01 00:00:00 | Current Era |
| Year 2027 Start | 1798761600 | 2027-01-01 00:00:00 | Upcoming milestone |
| Year 2030 Start | 1893456000 | 2030-01-01 00:00:00 | Decade boundary |
| Year 2038 Problem (Y2038) | 2147483647 | 2038-01-19 03:14:07 | 32-bit Integer Limit (231-1) |
| Year 2050 Start | 2524608000 | 2050-01-01 00:00:00 | Mid-century milestone |
| Year 2100 Start | 4102444800 | 2100-01-01 00:00:00 | 22nd century boundary |
| Max 64-bit Timestamp | 9223372036854775807 | +292,277,026,596 UTC | 64-bit integer limit (263-1) |
Unix Timestamps in Programming Languages
Code snippets to get current timestamp, convert timestamp to date, and format date to timestamp.
// PHP Unix Timestamp Examples
$now = time(); // Current Unix timestamp in seconds (e.g. 1700000000)
// Convert Timestamp to Human Date
$dateStr = date('Y-m-d H:i:s', $now);
// Convert Human Date to Unix Timestamp
$timestamp = strtotime('2026-01-01 00:00:00');
// DateTime Immutable with Timezone
$dt = (new DateTimeImmutable('@' . $now))->setTimezone(new DateTimeZone('Asia/Kolkata'));
echo $dt->format('Y-m-d H:i:s T');Unix Timestamp vs. Epoch Time: Definitions & Standards
Direct Answer:Unix time (also referred to as Epoch time or POSIX time) is a standardized numeric system for describing a point in time, defined as the total number of seconds that have elapsed since the Unix Epoch: January 1, 1970 at 00:00:00 UTC, minus leap seconds.
Established by Ken Thompson and Dennis Ritchie during the development of early Unix at Bell Labs and codified in the IEEE POSIX 1003.1 Standard, Unix timestamps solve the cross-platform complexity of regional calendars, daylight saving rules, and formatting variations by storing time as a single, unambiguous scalar integer.
Timestamp Units: Seconds, Milliseconds, Microseconds & Nanoseconds
Direct Answer: Different programming languages and database engines record Unix time at different precisions: standard Unix seconds (10 digits), JavaScript / Java milliseconds (13 digits), Python microseconds (16 digits), and Go / Rust nanoseconds (19 digits).
| Unit | Digit Count | Example Representation | Primary Environments |
|---|---|---|---|
| Seconds (s) | 10 digits | 1700000000 | PHP time(), Python int(time.time()), MySQL, Linux CLI |
| Milliseconds (ms) | 13 digits | 1700000000000 | JavaScript Date.now(), Java System.currentTimeMillis() |
| Microseconds (μs) | 16 digits | 1700000000000000 | PostgreSQL CLOCK_TIMESTAMP(), Python time.time_ns() // 1000 |
| Nanoseconds (ns) | 19 digits | 1700000000000000000 | Go time.Now().UnixNano(), Rust SystemTime::now() |
How Unix Timestamps Handle Timezones and Daylight Saving Time (DST)
Direct Answer: A Unix timestamp represents an absolute global instant in Coordinated Universal Time (UTC) and contains no timezone or Daylight Saving Time (DST) offset information.
For example, the Unix timestamp 1700000000 represents the exact same physical moment across the globe: 2023-11-14 22:13:20 UTC in London, 2023-11-15 03:43:20 IST in New Delhi, and 2023-11-14 17:13:20 EST in New York. The conversion into local wall-clock time is performed by the presentation layer using the IANA Time Zone Database (tzdb).
Negative Unix Timestamps (Dates Before 1970)
Direct Answer: Negative Unix timestamps represent dates that occurred prior to January 1, 1970 00:00:00 UTC. Signed integer timestamps decrement backward toward negative infinity for historical dates.
For instance, -1 represents December 31, 1969 23:59:59 UTC, and -14159040 represents July 20, 1969 20:17:40 UTC (the Apollo 11 Lunar Landing). Most modern 64-bit programming libraries seamlessly support negative timestamps back to 292 billion years BC.
Real-World Developer Use Cases: APIs, Databases, Logs & JWTs
Direct Answer: Unix timestamps are the industry standard for backend API contracts, database indexing, distributed server log tracing, and JSON Web Token (JWT) cryptographic validation.
REST & GraphQL API Responses
APIs deliver timestamps as pure integers to prevent timezone parsing errors on mobile and web clients:
{ "id": 101, "created_at": 1700000000 }JSON Web Tokens (JWT)
Standard RFC 7519 JWT claims (iat, exp, nbf) use NumericDate Unix timestamps:
{ "sub": "usr_42", "iat": 1700000000, "exp": 1700003600 }Database Indexing & Querying
Comparing 4-byte or 8-byte integer indices is orders of magnitude faster than evaluating string date ranges:
SELECT * FROM orders WHERE created_at >= 1700000000;Distributed Server Log Tracing
Microservice log collectors (e.g. OpenTelemetry, Datadog, Elasticsearch) correlate event traces via Unix ms:
1700000000123 [ERROR] upstream_timeout endpoint=/checkoutCommon Unix Timestamp Mistakes and How to Avoid Them
Direct Answer: The most frequent developer errors with Unix timestamps include mixing up seconds and milliseconds (causing dates in the year 53000), ignoring source timezones when parsing dates, and storing timestamps in 32-bit integer database columns.
- Mistake 1: The 1,000x Seconds vs. Milliseconds Bug: Passing a 10-digit timestamp (seconds) to JavaScript's
new Date(ts)treats the value as milliseconds, yielding dates in January 1970. Always multiply seconds by 1000 in JavaScript:new Date(ts * 1000). - Mistake 2: Assuming Timestamps Store Local Time: Timestamps are absolute UTC integers. If you convert
2026-05-01 10:00:00without specifying the timezone, system libraries will assume your local server offset. - Mistake 3: Storing Timestamps in 32-Bit Integer Columns: Using SQL
INT(11)signed columns will cause overflow on January 19, 2038. Always useBIGINTor nativeTIMESTAMP / TIMESTAMPTZcolumn types.
The Year 2038 Problem (Y2038) & 64-Bit Solutions
Direct Answer: The Year 2038 problem occurs when a signed 32-bit integer timestamp exceeds 2,147,483,647 on January 19, 2038 at 03:14:07 UTC, wrapping to -2,147,483,648 (December 13, 1901).
Modern 64-bit operating systems and programming runtime engines use 64-bit integers (int64_t), expanding timestamp headroom to 9,223,372,036,854,775,807 seconds (approximately 292 billion years into the future), completely mitigating overflow risk for contemporary applications.
Related Developer Utilities & Time Tools
Explore our connected suite of developer utilities for JSON inspection, time calculation, data conversion, and encoding.
Frequently Asked Questions
Answers to common questions about Unix timestamps, epoch time, and timezone conversions.
What is the difference between Unix timestamp and Epoch time?
Direct Answer:
The terms are often used interchangeably. The "Unix Epoch" is the exact starting reference moment: January 1, 1970 at 00:00:00 UTC. A "Unix Timestamp" (or POSIX time) is the total count of elapsed seconds (or milliseconds) from that epoch to a specific point in time, excluding leap seconds.
How can I tell if a timestamp is in seconds, milliseconds, microseconds, or nanoseconds?
Direct Answer:
You can distinguish timestamp units by their total digit count: 10 digits represent Seconds (e.g. 1700000000), 13 digits represent Milliseconds (e.g. 1700000000000 as used in JavaScript Date.now()), 16 digits represent Microseconds (e.g. 1700000000000000 in Python time_ns / C++), and 19 digits represent Nanoseconds (e.g. 1700000000000000000 in Go and Rust).
Do Unix timestamps store timezone information?
Direct Answer:
No. Unix timestamps are completely timezone-agnostic and universally represent a single instant in Coordinated Universal Time (UTC). Timezones (such as EST, PST, GMT, or IST) are only applied when formatting the timestamp into a localized human-readable date string.
Can a Unix timestamp be negative?
Direct Answer:
Yes. Negative Unix timestamps represent dates and times before January 1, 1970 00:00:00 UTC. For example, -14159040 corresponds to July 20, 1969 20:17:40 UTC, the historic moment the Apollo 11 Lunar Module landed on the Moon.
What is the Year 2038 Problem (Y2038)?
Direct Answer:
The Year 2038 problem occurs on legacy 32-bit systems storing Unix time as a signed 32-bit integer. On January 19, 2038 at 03:14:07 UTC, the integer reaches its maximum capacity (2,147,483,647) and overflows into negative numbers (-2,147,483,648), wrapping back to December 13, 1901. Modern 64-bit systems use 64-bit integers, preventing overflow for over 292 billion years.
Why does JavaScript Date.now() return a number 1000x larger than PHP time()?
Direct Answer:
PHP's time() and Python's time.time() return Unix time in seconds (10 digits), whereas JavaScript's Date.now() and Java's System.currentTimeMillis() return Unix time in milliseconds (13 digits). To convert JavaScript milliseconds to standard Unix seconds, divide by 1000 using Math.floor(Date.now() / 1000).