The CslSerializer doesn't convert timestamps to GMT. This may lead to problems. The ISO 8601 representation is
YYYY[-MM[-DD[Thh[:mm[:ss[.s]]][TZD]]]]
The optional value represented by TZD in the pattern is a reference to Universal Coordinated Time (UTC). The TZD value designates the time zone assumed in the time stamp. This is expressed as a positive or negative time offset in hours and possibly minutes, or by the value Z which means "zero offset from UTC".
The CslSerializer shall allways serialize into/deserialize from UTC using a "Z" as TZD. So
ts := Timestamp fromSeconds: (TimeZone default convertLocalSecondsToGMT: Timestamp now asSeconds). tsString := CslSerializer serialize: ts.
leads to
2007-02-21T18:35:13.000Z
as timestamp string.
Implementation
2007-02-21
Timestamp now serialized to UTC based on the default timezone