Convert Seconds & Days Since Year 0/1

Seconds Since Year 0

This tool converts seconds since year 0 to human readable dates.
It's compatible with MySQL's TO_SECONDS function (MySQL 5.5+).
Year 0 is defined as 0000-00-00 00:00 GMT. Please note that this is not a valid date! There is no year 0.

At this time there are ~63667838996 seconds since year 0 (6.367*1010) .
Visit the homepage to convert to/from seconds since 1/1/1970.

Convert seconds to normal date:


Days Since Year 0

Compatible with MySQL's TO_DAYS function (MySQL 5.5+).

There are 736896 days between 0000-00-00 and today (Jul 21, 2017).

Convert days to normal date:


Seconds Since 0001-01-01 AD

This tool converts seconds since January 1, 1 AD (extrapolated Gregorian calendar) to regular dates.
There were ~63636216596 seconds since Jan, 1 0001 (6.364*1010).


Days Since 0001-01-01 AD

There were 736530 days since January 1, 1 AD.


Please note: This page uses JavaScript to convert times & dates. This may not work properly in all browsers.


Date and Time
Week numbers
Weeks by year
Day numbers
Days by year
Years/leap years
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