Time Converter Online | Timestamp & Timezone Calculator

Online time converter for timestamps, timezones, and multiple time formats. Convert between Unix timestamp, ISO 8601, RFC 3339 and custom formats.

Select Timezone
Current Time
Current Timestamp (seconds)
Current Timestamp (milliseconds)
Date Time
Unix Timestamp (seconds)
Unix Timestamp (milliseconds)
ISO 8601
RFC 2822
Date
Day of Year
Week of Year

Timezone Conversion

UTC
Hong Kong (UTC+8)
Taipei (UTC+8)
Tokyo (UTC+9)
Seoul (UTC+9)
Singapore (UTC+8)
Bangkok (UTC+7)
Manila (UTC+8)
Jakarta (UTC+7)
Dubai (UTC+4)
Kolkata (UTC+5:30)
Tehran (UTC+3:30)
London (UTC+0/1)
Paris (UTC+1/2)
Berlin (UTC+1/2)
Madrid (UTC+1/2)
Rome (UTC+1/2)
Moscow (UTC+3)
Amsterdam (UTC+1/2)
Stockholm (UTC+1/2)
Istanbul (UTC+3)
New York (UTC-4/5)
Los Angeles (UTC-7/8)
Chicago (UTC-5/6)
Toronto (UTC-4/5)
Vancouver (UTC-7/8)
Mexico City (UTC-6)
Sao Paulo (UTC-3)
Buenos Aires (UTC-3)
Sydney (UTC+10/11)
Melbourne (UTC+10/11)
Perth (UTC+8)
Auckland (UTC+12/13)
Cairo (UTC+2)
Johannesburg (UTC+2)
Lagos (UTC+1)
Nairobi (UTC+3)

Time Conversion Knowledge

Unix Timestamp

Unix timestamp represents seconds elapsed since January 1, 1970 (UTC/GMT midnight), excluding leap seconds. Common formats include seconds (10 digits) and milliseconds (13 digits).

ISO 8601

ISO 8601 is the international standard for date and time representation, formatted as YYYY-MM-DDThh:mm:ss.sssZ. 'T' marks the start of time, 'Z' indicates UTC timezone, or +/-HH:mm for other zones.

RFC 2822

RFC 2822 is the time format specified in Internet email standards, e.g., Tue, 01 Jan 2024 12:00:00 +0800. This format is widely used in emails and RSS feeds.

Coordinated Universal Time (UTC)

UTC is the primary time standard, based on atomic clocks and Earth's rotation. It's unaffected by daylight saving time and serves as a stable time reference. GMT is practically synonymous with UTC.

Time Zones

Time zones are regions using the same time standard. They're typically expressed as UTC offsets, like UTC+8 (Beijing time). A zone's offset may vary seasonally due to daylight saving time.

Daylight Saving Time (DST)

DST involves advancing clocks by one hour during certain dates. Implementation varies by country, and some regions (like China) don't use it at all. This adds complexity to time conversions.

Julian Date and Modified Julian Date

Julian Date (JD) is used in astronomy, counting from 4713 BCE. Modified Julian Date (MJD) is a simplified version starting from November 17, 1858, equal to JD-2400000.5.

Leap Seconds

Leap seconds adjust UTC to account for irregular changes in Earth's rotation. They can be positive (23:59:60) or negative (skipping 23:59:59). The last leap second adjustment was on December 31, 2016.

The tools on this site are strictly prohibited for illegal purposes. We do not bear any losses and responsibilities caused by using the tools.
Friend Links
© 2025 calctools.online All Rights Reserved