Red cross means that the date is not recognized as a valid date (e.g. "Christmas week of 61", or "the summer when I had surgery"). In such a case the date will be stored as a text string and therefore cannot be compared to other dates. As you can see, it is best to avoid such date entries. It would be better, for example, to enter a date of "December 1961" and then to add the note "Christmas week of '61."

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