public static String parseChar(String charStr) {
        if (StringUtils.isNumeric(charStr)) {
            char numberChar = (char) Integer.parseInt(charStr);
            charStr = Character.toString(numberChar);
        }
        return charStr;
    }
Parse date time form string format to unix format.
Only support <b>yyyyMMdd</b>, <b>yyyyMMddHH</b> and <b>yyyyMMddHHmm</b> precision
whose length is 8, 10 and 12 respectively.

@param value Date time in string format.
@return Unix date time.
inlong-common/src/main/java/org/apache/inlong/common/util/StringUtil.java