liquibase-core/src/main/java/liquibase/util/NowAndTodayUtil.java
public static boolean isNowOrTodayFormat(String value) {
        boolean ret = false;
        if (value != null) {
            String lowerValue = value.toLowerCase();
            if (lowerValue.length() >= NOW_LENGTH && lowerValue.startsWith(NOW)) {
                ret = true;
            } else if (lowerValue.length() >= TODAY_LENGTH && lowerValue.startsWith(TODAY)) {
                ret = true;
            }
        }
        return ret;
    }
public static boolean isNowOrTodayFormat(String value) {
        boolean ret = false;
        if (value != null) {
            String lowerValue = value.toLowerCase();
            if (lowerValue.length() >= NOW_LENGTH && lowerValue.startsWith(NOW)) {
                ret = true;
            } else if (lowerValue.length() >= TODAY_LENGTH && lowerValue.startsWith(TODAY)) {
                ret = true;
            }
        }
        return ret;
    }
Checks if date starts with "NOW" or "TODAY".

@param value value to test
@return true if value starts with "NOW" or "TODAY" (case insensitive), false otherwise.