Re: [art] Predictable Internet Time

[Philip Homburg <[e-mail]>]

>> Every time_t value has a specific interpretation as a UTC timestamp.
>There is an intended correlation between Unix dates and UTC dates, but
>it isn't exact - the equation is indicated as approximate.

Quoting the opengroup docs, and this is the last thing I will say
about POSIX time:

"4.16 Seconds Since the Epoch
"
"A value that approximates the number of seconds that have elapsed since the Epoch. A Coordinated Universal Time name (specified in terms of seconds (tm_sec), minutes (tm_min), hours (tm_hour), days since January 1 of the year (tm_yday), and calendar year minus 1900 (tm_year)) is related to a time represented as seconds since the Epoch, according to the expression below.
"
"If the year is <1970 or the value is negative, the relationship is undefined. If the year is >=1970 and the value is non-negative, the value is related to a Coordinated Universal Time name according to the C-language expression, where tm_sec, tm_min, tm_hour, tm_yday, and tm_year are all integer types:
"
"tm_sec + tm_min*60 + tm_hour*3600 + tm_yday*86400 +
"    (tm_year-70)*31536000 + ((tm_year-69)/4)*86400 -
"    ((tm_year-1)/100)*86400 + ((tm_year+299)/400)*86400

Feel free to define POSIX time as you wish. This what the opengroup says
about it.