Function std.datetime.systime.SysTime.fromISOString
Creates a SysTime
from a string with the format
YYYYMMDDTHHMMSS.FFFFFFFTZ (where F is fractional seconds is the time
zone). Whitespace is stripped from the given string.
The exact format is exactly as described in toISOString
except that
trailing zeroes are permitted - including having fractional seconds with
all zeroes. However, a decimal point with nothing following it is
invalid. Also, while toISOString
will never generate a string
with more than 7 digits in the fractional seconds (because that's the
limit with hecto-nanosecond precision), it will allow more than 7 digits
in order to read strings from other sources that have higher precision
(however, any digits beyond 7 will be truncated).
If there is no time zone in the string, then
LocalTime
is used. If the time zone is "Z",
then UTC
is used. Otherwise, a
SimpleTimeZone
which corresponds to the
given offset from UTC is used. To get the returned SysTime
to be
a particular time zone, pass in that time zone and the SysTime
to be returned will be converted to that time zone (though it will still
be read in as whatever time zone is in its string).
The accepted formats for time zone offsets are +HH, -HH, +HHMM, and -HHMM.
Warning:
Previously, toISOString
did the same as
toISOExtString
and generated +HH:MM or -HH:MM for the time
zone when it was not LocalTime
or
UTC
, which is not in conformance with
ISO 8601 for the non-extended string format. This has now been
fixed. However, for now, fromISOString will continue to accept the
extended format for the time zone so that any code which has been
writing out the result of toISOString to read in later will continue
to work. The current behavior will be kept until July 2019 at which
point, fromISOString will be fixed to be standards compliant.
Parameters
Name | Description |
---|---|
isoString | A string formatted in the ISO format for dates and times. |
tz | The time zone to convert the given time to (no conversion occurs if null). |
Throws
DateTimeException
if the given string is
not in the ISO format or if the resulting SysTime
would not
be valid.
Example
import core .time : hours, msecs, usecs, hnsecs;
import std .datetime .date : DateTime;
import std .datetime .timezone : SimpleTimeZone, UTC;
assert(SysTime .fromISOString("20100704T070612") ==
SysTime(DateTime(2010, 7, 4, 7, 6, 12)));
assert(SysTime .fromISOString("19981225T021500.007") ==
SysTime(DateTime(1998, 12, 25, 2, 15, 0), msecs(7)));
assert(SysTime .fromISOString("00000105T230959.00002") ==
SysTime(DateTime(0, 1, 5, 23, 9, 59), usecs(20)));
assert(SysTime .fromISOString("20130207T043937.000050392") ==
SysTime(DateTime(2013, 2, 7, 4, 39, 37), hnsecs(503)));
assert(SysTime .fromISOString("-00040105T000002") ==
SysTime(DateTime(-4, 1, 5, 0, 0, 2)));
assert(SysTime .fromISOString(" 20100704T070612 ") ==
SysTime(DateTime(2010, 7, 4, 7, 6, 12)));
assert(SysTime .fromISOString("20100704T070612Z") ==
SysTime(DateTime(2010, 7, 4, 7, 6, 12), UTC()));
assert(SysTime .fromISOString("20100704T070612-0800") ==
SysTime(DateTime(2010, 7, 4, 7, 6, 12),
new immutable SimpleTimeZone(hours(-8))));
assert(SysTime .fromISOString("20100704T070612+0800") ==
SysTime(DateTime(2010, 7, 4, 7, 6, 12),
new immutable SimpleTimeZone(hours(8))));