Unix Timestamp 1513899600
seconds · 8 years ago
⚡ Quick Answer
1513899600 = Dec 21, 2017, 11:40:00 PM UTC
ISO 8601: 2017-12-21T23:40:00.000Z
Output Formats
ISO 8601
2017-12-21T23:40:00.000Z
RFC 2822
Thu, 21 Dec 2017 23:40:00 GMT
Human Readable
Thursday, December 21, 2017 at 11:40:00 PM UTC
Unix Seconds
1513899600
Unix Milliseconds
1513899600000
Day of Week
Thursday
Timezone Breakdown
UTC
Dec 21, 2017, 11:40:00 PM UTC
US Eastern
Dec 21, 2017, 06:40:00 PM EST
US Pacific
Dec 21, 2017, 03:40:00 PM PST
UK London
Dec 21, 2017, 11:40:00 PM GMT
Japan Tokyo
Dec 22, 2017, 08:40:00 AM GMT+9
Australia Sydney
Dec 22, 2017, 10:40:00 AM GMT+11
Related Timestamps
Frequently Asked Questions
What date is Unix timestamp 1513899600?
Unix timestamp 1513899600 represents Thursday, December 21, 2017 at 11:40:00 PM UTC. This is 8 years ago from the current time.
Is 1513899600 in seconds or milliseconds?
1513899600 has 10 digits, which means it is in seconds. Multiply by 1,000 to get milliseconds: 1513899600000.
How do I convert 1513899600 in JavaScript?
// Normalized to Unix seconds: 1513899600 const tsSec = 1513899600; new Date(tsSec * 1000).toISOString(); // "2017-12-21T23:40:00.000Z"
How do I convert 1513899600 in Python?
import datetime
ts = 1513899600
dt = datetime.datetime.fromtimestamp(
ts, tz=datetime.timezone.utc)
print(dt.isoformat())
# "2017-12-21T23:40:00.000Z"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.