Timestamp to Date Converter

10-digit vs 13-digit Timestamp Comparison

The two units differ by a factor of 1000 — mixing them shifts the converted date by decades. This tool auto-detects seconds/milliseconds, so you do not need to guess; the top of the page also shows the current timestamp in both units, tap to copy.

What Is a Unix Timestamp?

A Unix timestamp counts the total seconds since 1970-01-01 00:00:00 UTC, also called Epoch time. Second-level timestamps are 10 digits, millisecond-level ones are 13 digits — different units separated by a factor of 1000, so mixing them shifts results by decades. This tool auto-detects the unit and supports 40+ timezones. When debugging API logs, pair it with the JSON Formatter, compute date intervals with the Date Calculator, or format dates with the Date Formatter.

Per the POSIX (IEEE Std 1003.1) definition, every Unix day is exactly 86400 seconds with no leap seconds — the 27 leap seconds added since 1972 are smoothed over. Unix time is therefore not an exact representation of UTC. Most development is unaffected, but precision time works (astronomy, finance, scientific computing) must account for it.

Seconds for common time units, handy when estimating logs and cache expiry:

Timestamps in Popular Languages

JavaScript/Node.js: Date.now() returns millisecond timestamps, new Date(ts) converts to a date; Python: int(time.time()) for seconds, datetime.fromtimestamp(ts) for a date; Java: System.currentTimeMillis()/1000 for seconds, new Date(ts*1000L) for a date; PHP: time() for seconds, date('Y-m-d H:i:s', ts) for a date; Go: time.Now().Unix() for seconds, time.Unix(ts, 0) for a date. Different languages default to different precision (seconds/milliseconds) and timezone handling — use this tool to verify cross-language conversion results.

How to Use the Timestamp Converter

Timestamp → date: paste a 10- or 13-digit timestamp, choose a timezone, then click Convert to see the date, weekday, and UTC time. The top of the page shows the live current timestamp in seconds and milliseconds — tap to copy instantly. Batch conversion: switch to batch mode, one timestamp per line, and convert many log or database timestamps at once. Date → timestamp: for the reverse direction use the Date Formatter.

Timestamp Conversion FAQ

Common Date ↔ Timestamp Reference

Each row is the timestamp at Beijing midnight (UTC+8) for that date — handy for quick checks against logs and databases. For other timezones or arbitrary moments, use the "timestamp → date" or "date → timestamp" input above.

Timestamp Code Snippets by Language

Default precision and APIs differ by language. Below are common ways to get and convert timestamps — click "copy" to paste into your project:

// timestamp (ms) → date
const d = new Date(1705293000000);
console.log(d.toISOString());
// date → seconds timestamp
Math.floor(Date.now() / 1000);

from datetime import datetime, timezone
# timestamp (seconds) → date
d = datetime.fromtimestamp(1705293000)
print(d.isoformat())
# date → seconds timestamp
import time
int(time.time())

// timestamp (ms) → date
java.util.Date d = new java.util.Date(1705293000000L);
System.out.println(d.toInstant());
// current seconds timestamp
long ts = System.currentTimeMillis() / 1000;

import "time"
// timestamp (seconds) → date
t := time.Unix(1705293000, 0)
fmt.Println(t.Format(time.RFC3339))
// current seconds timestamp
int64(time.Now().Unix())

// timestamp (seconds) → date
var dt = DateTimeOffset.FromUnixTimeSeconds(1705293000);
Console.WriteLine(dt.ToString("o"));
// current seconds timestamp
DateTimeOffset.Now.ToUnixTimeSeconds();