Method parse8601

java/lib/src/main/java/io/github/ccxt/base/Time.java:107–141

(Object datetime2)

    // }

    public static Long parse8601(Object datetime2) {
        if (!(datetime2 instanceof String)) {
            return null;
        }

        String datetime = stripUtcSuffix(((String) datetime2).trim());
        if (datetime.isEmpty()) {
            return null;
        }

        try {
            if (datetime.indexOf('T') >= 0) {
                if (datetime.endsWith("Z")) {
                    return Instant.parse(datetime).toEpochMilli();
                }
                // Offset form: "+HH:MM", "+HHMM", "-HH:MM", "-HHMM" at the tail
                if (datetime.matches(".*[+-]\\d{2}:?\\d{2}$")) {
                    // ISO_OFFSET_DATE_TIME requires "+HH:MM"; insert colon if absent
                    String normalized = datetime.replaceFirst("([+-]\\d{2})(\\d{2})$", "$1:$2");
                    return OffsetDateTime.parse(normalized, DateTimeFormatter.ISO_OFFSET_DATE_TIME)
                            .toInstant().toEpochMilli();
                }
                // No zone/offset: treat as UTC
                LocalDateTime ldt = LocalDateTime.parse(datetime);
                return ldt.toInstant(ZoneOffset.UTC).toEpochMilli();
            }

            // Space format, e.g. "2019-08-12 13:20:00" (treat as UTC)
            LocalDateTime ldt = LocalDateTime.parse(datetime, SPACE_FORMAT);
            return ldt.toInstant(ZoneOffset.UTC).toEpochMilli();

        } catch (DateTimeParseException ex) {
            return null;
        }
    }

    // Aftermath (and a few other exchanges) return datetimes like
    // "2025-12-29 22:43:54.639 UTC". JS's Date.parse and Python's dateutil