Traditional Culture Encyclopedia - Almanac inquiry - How to determine the date of hand-torn invoice? Where can I know the year of the invoice?

How to determine the date of hand-torn invoice? Where can I know the year of the invoice?

The dates on some invoices are hidden in a long string of numbers. Look carefully for Arabic numerals in the form of dates; Some invoices are filled in by hand and printed with "year, month and day"; Some invoices have no date at all, but the instructions on the back or front will indicate the due date.