One reason why ISO8601 is the best date string format, is that you can simply append as much precision as you like. Given 2 integers representing seconds and nanoseconds that have passed since
1970-01-01T00:00:00, return an ISO8601 string as described below.
The standard output format without timezone looks like this:
The date is encoded as "year, month,day" with 4,2,2 digits respectively, separated by a "-". The time of day is encoded as "hour, minute, seconds" with 2,2,2 digits respectively. Then, optionally a dot with exactly 6 digits of precision can follow, encoding microseconds that have passed after the given date+(time in hours+minutes+seconds) since. This is only appended if it'd be not equal to 000000. See examples below
Yes, we are allowed to append 6 digits(microseconds) of precision and theoretically more are simply appendable, though not defined further in the standard.
You'll get 2 integers(seconds, nanoseconds). For the sake of simplicity, let's constrain them to be within
0 <= x < 10^9 both. Make sure to discard/round down any precision beyond microseconds.
Input: 616166982 , 34699909 Output: 1989-07-11T13:29:42.034699 Input: 982773555 , 886139278 Output: 2001-02-21T16:39:15.886139 Input: 885454423 , 561869693 Output: 1998-01-22T07:33:43.561869 Input: 0 , 100000 Output: 1970-01-01T00:00:00.000100 Input: 0 , 1000 Output: 1970-01-01T00:00:00.000001 Input: 0 , 999 Output: 1970-01-01T00:00:00 Input: 999999999 , 999999999 Output: 2001-09-09T01:46:39.999999
Provide a function that takes in 2 integers as described in the Input section and returns a String as described in the Output section.
For details and limitations for input/output please refer to the default input/output rules.
This is codegolf: Shortest solution in bytes wins.