我正在寻找一个允许我解析 ISO8601 时间戳的通用函数。我知道，to_timestamp_tz但我找不到一种方法来创建一个format参数来解析 ISO-8601 日期时间的所有可能变化：
select '2012-01-01T12:00:00+00:00'::timestamp_tz; // this works
select '2012-01-01T12:00:00+0000'::timestamp_tz; //Timestamp '2012-01-01T12:00:00+0000' is not recognized, although is a valid iso8601 (no colon in the timezone)
select to_timestamp_tz('2012-01-01T12:00:00.123456+00:00', 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM'); // works
select to_timestamp_tz('2012-01-01T12:00:00.123456+0000', 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM'); // Can't parse '2012-01-01T12:00:00.123456+0000' as timestamp with format 'YYYY-MM-DDTHH24:MI:SS.FFTZH:TZM', again because of it has no colon in the timezone
select to_timestamp_tz('2012-01-01T12:00:00.123456+0000', 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM'); //works
select to_timestamp_tz('2012-01-01T12:00:00.123456+00:00', 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM'); //Can't parse '2012-01-01T12:00:00.123456+00:00' as timestamp with format 'YYYY-MM-DDTHH24:MI:SS.FFTZHTZM' , fails because it doesn't expect a …