Unix Timestamp 646006400
seconds · 36 years ago
⚡ Quick Answer
646006400 = Jun 21, 1990, 10:13:20 PM UTC
ISO 8601: 1990-06-21T22:13:20.000Z
Output Formats
ISO 8601
1990-06-21T22:13:20.000Z
RFC 2822
Thu, 21 Jun 1990 22:13:20 GMT
Human Readable
Thursday, June 21, 1990 at 10:13:20 PM UTC
Unix Seconds
646006400
Unix Milliseconds
646006400000
Day of Week
Thursday
Timezone Breakdown
UTC
Jun 21, 1990, 10:13:20 PM UTC
US Eastern
Jun 21, 1990, 06:13:20 PM EDT
US Pacific
Jun 21, 1990, 03:13:20 PM PDT
UK London
Jun 21, 1990, 11:13:20 PM GMT+1
Japan Tokyo
Jun 22, 1990, 07:13:20 AM GMT+9
Australia Sydney
Jun 22, 1990, 08:13:20 AM GMT+10
Related Timestamps
Frequently Asked Questions
What date is Unix timestamp 646006400?
Unix timestamp 646006400 represents Thursday, June 21, 1990 at 10:13:20 PM UTC. This is 36 years ago from the current time.
Is 646006400 in seconds or milliseconds?
646006400 has 9 digits, which means it is in seconds. Multiply by 1,000 to get milliseconds: 646006400000.
How do I convert 646006400 in JavaScript?
// Normalized to Unix seconds: 646006400 const tsSec = 646006400; new Date(tsSec * 1000).toISOString(); // "1990-06-21T22:13:20.000Z"
How do I convert 646006400 in Python?
import datetime
ts = 646006400
dt = datetime.datetime.fromtimestamp(
ts, tz=datetime.timezone.utc)
print(dt.isoformat())
# "1990-06-21T22:13:20.000Z"What is the Unix timestamp for right now?
Use our live timestamp converter to get the current Unix timestamp. In JavaScript: Math.floor(Date.now() / 1000). In Python: int(time.time()). In bash: date +%s.
Need to convert a different timestamp?
Our full converter supports seconds, milliseconds, microseconds, 25+ timezones, and auto-detection.
Open Full Converter →Related Guides & Tutorials
// developers also readComplete Guide to Unix Timestamp Precision in 2026
The definitive guide to Unix timestamp precision, formats, and edge cases in production.
Unix Timestamps in JavaScript
Date.now(), the Temporal API, and timezone-aware timestamp handling in JavaScript.
Session Management with Timestamp Expiration
JWT expiration, session timeouts, and token refresh using Unix timestamps.