The CSV format is
The delimiter to separate the items can be chosen ',' and Tab and ';' on the screen.
When the year, month and day are specified, Its date format is yyyy/MM/dd .
When the year, month are specified, the date format is yyyy/MM .
When only the year is specified, the date format is yyyy .
The character that separates the day, month, and year can be specified
one non-numerical character without '/'.
"1990.1.21" can be specified.
The non-numerical characters between the numerical character of the date and the delimiter are ignored as input data.
When "1990.1.21xxxx, " is specified, "xxxx" is ignored.
When the BC date is specified, please add B.C. or BC or - before the number of the year.
The date: "May 03, 41 BC" can be inputted at any "B.C.41/5/3" or "BC41/5/3" or "-41/5/3" .
If Start_Date > End_Date, it is not possible to input its line.
The Start_Date item is need to input. the empty End_Date item is OK.
If the item quoted with double quotes, its double quote cannot be inputed.
If Period_Name item is empty, it is not possible to input its line.