Function std.datetime.SysTime.toISOString

Note that the number of digits in the fractional seconds varies with the number of fractional seconds. It's a maximum of 7 (which would be hnsecs), but only has as many as are necessary to hold the correct value (so no trailing zeroes), and if there are no fractional seconds, then there is no decimal point.

If this SysTime's time zone is LocalTime, then TZ is empty. If its time zone is UTC, then it is "Z". Otherwise, it is the offset from UTC (e.g. +1:00 or -7:00). Note that the offset from UTC is not enough to uniquely identify the time zone.

Time zone offsets will be in the form +HH:MM or -HH:MM.

Prototype

string toISOString() nothrow @safe const;

Example

assert(SysTime(DateTime(2010, 7, 4, 7, 6, 12)).toISOString() ==
       "20100704T070612");

assert(SysTime(DateTime(1998, 12, 25, 2, 15, 0),
               msecs(24)).toISOString() ==
       "19981225T021500.024");

assert(SysTime(DateTime(0, 1, 5, 23, 9, 59)).toISOString() ==
       "00000105T230959");

assert(SysTime(DateTime(-4, 1, 5, 0, 0, 2),
               hnsecs(520_920)).toISOString() ==
       "-00040105T000002.052092");