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public static Long stringToTimestamp(String timeText, String pattern, String timezone) throws ParseException {
        Long timestamp;

        try {
            DateTimeFormatter dfs = new DateTimeFormatterBuilder()
                    .appendOptional(DateTimeFormatter.ofPattern(pattern))
                    .toFormatter(Locale.US);

            timestamp = LocalDateTime.parse(timeText,
                            dfs)
                    .atZone(ZoneId.of(timezone))
                    .toEpochSecond();
        } catch (Exception e) {
            try {
                DateTimeFormatter dfs = new DateTimeFormatterBuilder()
                        .appendOptional(DateTimeFormatter.ofPattern(pattern))
                        .optionalStart()
                        .append(DateTimeFormatter.ofPattern(pattern))
                        .parseDefaulting(ChronoField.HOUR_OF_DAY, 0)
                        .parseDefaulting(ChronoField.MINUTE_OF_HOUR, 0)
                        .parseDefaulting(ChronoField.SECOND_OF_MINUTE, 0)
                        .optionalEnd()
                        .toFormatter(Locale.US);

                timestamp = LocalDateTime.parse(timeText,
                                dfs)
                        .atZone(ZoneId.of(timezone))
                        .toEpochSecond();
            } catch (Exception e1) {
                return null;
            }
        }

        return timestamp;
    }