How to tell if a timestamp is in seconds, milliseconds, or microseconds?

Timestamps in seconds currently have 10 digits (e.g. 1700000000). Timestamps in milliseconds have 13 digits (e.g. 1700000000000). Microseconds have 16 digits, and nanoseconds have 19 digits. Our converter automatically detects the unit based on digit length.

What is the Year 2038 Problem (Y2K38)?

Legacy systems storing Unix timestamps as 32-bit signed integers will overflow on January 19, 2038 at 03:14:07 UTC. Modern 64-bit operating systems use 64-bit integers which will not overflow for nearly 300 billion years.

Does this converter support IANA world timezones?

Yes! The converter uses your browser's native IANA Intl timezone database to convert timestamps into any world timezone (e.g. UTC, Local, America/New_York, Europe/London, Asia/Kolkata, Asia/Tokyo).

What date formatting standards are provided?

Outputs include UTC Date/Time, Local Timezone, ISO 8601 (YYYY-MM-DDTHH:mm:ss.sssZ), RFC 3339, RFC 2822, Day of Year (1-366), and ISO Week Number (1-53).

How do I get current timestamps in programming languages?

The Developer Snippets tab provides ready-to-use syntax for JavaScript (Date.now()), Python (time.time()), PHP (time()), Java (System.currentTimeMillis()), Go, SQL, C#, and Bash.

What do the Quick Presets do?

Presets instantly jump to common reference timestamps: Now (current time), Unix Epoch (0), Yesterday (-24h), Tomorrow (+24h), 1 Week Ago (-7d), and 1 Week From Now (+7d).

Are my converted timestamps or dates sent to a server?

No. All conversions, live clock updates, and timezone calculations take place 100% locally inside your web browser. No data is sent over the network or saved in localStorage.

Why does Unix time ignore leap seconds?

Unix time is defined as counting seconds continuously without leap seconds, making arithmetic calculations simple (86,400 seconds per day). When a leap second occurs, POSIX systems repeat the second 23:59:59.

Can negative timestamps be converted?

Yes! Negative timestamps represent dates prior to the January 1, 1970 Epoch (e.g. -315619200 corresponds to January 1, 1960 UTC).

Unix Timestamp & Epoch Converter – Convert Timestamps Online

01

What is a Unix Timestamp (Epoch Time)?

A Unix timestamp (also known as POSIX time or Epoch time) represents the total number of seconds elapsed since the Unix Epoch: 00:00:00 UTC on January 1, 1970 (excluding leap seconds). It provides a standardized, timezone-independent integer format widely used in backend databases, API payloads, and logging systems.

02

Seconds vs Milliseconds vs Microseconds

Standard Unix timestamps are 10-digit integers measuring seconds (e.g. 1700000000). JavaScript, Java, and modern web APIs frequently use 13-digit millisecond timestamps (e.g. 1700000000000). High-precision telemetry and database micro-benchmarks utilize 16-digit microsecond or 19-digit nanosecond precision integers.

03

The Year 2038 Problem (Y2K38 / Epochalypse)

Legacy 32-bit systems store timestamps as signed 32-bit integers, which max out at 2,147,483,647. On January 19, 2038 at 03:14:07 UTC, 32-bit counters will overflow into negative values (-2,147,483,647), causing dates to revert to December 13, 1901. Modern 64-bit systems eliminate this limit for 292 billion years.

04

Handling Timezones & ISO 8601 Strings

Unix timestamps are inherently UTC-based and contain no timezone metadata. Converting a timestamp for user presentation requires applying offset rules or IANA timezone identifiers (e.g. UTC, America/New_York, Asia/Kolkata) to format ISO 8601 strings (YYYY-MM-DDTHH:mm:ssZ).

05

How to Get Current Timestamp in Major Languages

In JavaScript: Date.now() (ms) or Math.floor(Date.now() / 1000) (s). In Python: import time; int(time.time()). In PHP: time(). In Java: System.currentTimeMillis(). In SQL: UNIX_TIMESTAMP() (MySQL) or EXTRACT(EPOCH FROM NOW()) (PostgreSQL).

06

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Unix Timestamp & Epoch Converter

Unix Timestamp & Epoch Converter

Live Unix Epoch Clock

Timestamp → Date Conversion

Date → Timestamp Conversion

Formatted Date Results

Developer Code Snippets

Year 2038 Problem (Y2K38 Overflow Analysis)