I'm getting ERROR: timestamp out of range: "1.52701e+15" when trying to convert an epoch stored as a bigint into a timestamp (value is taken from a real database table):

select to_timestamp(1527012834506374);
ERROR:  timestamp out of range: "1.52701e+15"

Other approaches to conversion don't work either:

select 1527012834506374::abstime::timestamp;
ERROR:  cannot cast type bigint to abstime

select 1527012834506374::integer::abstime::timestamp;
ERROR:  integer out of range

It's a valid epoch; https://www.epochconverter.com/ tells me 1527012834506374 is equivalent to 2018-05-22 06:13:54.506 UTC

How can I do the conversion using SQL in Postgres?


When I paste the value 1527012834506374 into https://www.epochconverter.com/ I see the warning:

Assuming that this timestamp is in microseconds (1/1,000,000 second):

Postgres' to_timestamp() assumes an epoch with seconds, not microseconds, so you need to use:

select to_timestamp(1527012834506374 / 1000000.0)
  • 1
    Agreed, by definition the Unix epoch is a number of seconds in a 32 bits signed integer, hence the maximum value possible is 2 147 483 647, anything higher than that is something else, like the epoch padded with 3 digits of milliseconds or 6 digits of microseconds. – Patrick Mevzek Dec 19 '18 at 16:09
  • 2
    Make that to_timestamp(1527012834506374 / 1000000.0) to avoid integer division truncating fractional digits. – Erwin Brandstetter Dec 19 '18 at 16:48
  • @PatrickMevzek And I was wondering why the numbers I had looked so big. They come from ejabberd's archive table. Spot the DBA here that never stores dates and times as numbers :-) – Colin 't Hart Dec 19 '18 at 19:07

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