Serial Numbers A serial number is a date-time code used by BASIC to represent dates and times between Jan. 1, 1753 and Dec. 31, 2078. Serial-Number Format Numbers to the left of the decimal point represent the date; numbers to the right of the decimal point represent the time. For example. ----------------------------------------------------------------------------- Serial number Date and time represented ---------------------------------------------------------------------------- 20323.25 August 22, 1955 6.00 A.M. Serial number Date and time represented ---------------------------------------------------------------------------- 20323.25 August 22, 1955 6.00 A.M. 20324.25 August 23, 1955 6.00 A.M. 367.5 January 1, 1901 12.00 P.M. 367.75 January 2, 1901 6.00 P.M. A serial number with no fractional part represents a date only. A serial number with only a fractional part represents a time only. The date portion of the serial number (to the left of the decimal point) can represent dates ranging from January 1, 1753, through December 31, 2078. Dates before December 30, 1899 are represented by negative numbers; dates after December 30, 1899 are represented by positive numbers. ----------------------------------------------------------------------------- Serial number Date represented ---------------------------------------------------------------------------- -1 December 29, 1899 Serial number Date represented ---------------------------------------------------------------------------- -1 December 29, 1899 0 December 30, 1899 1 December 31, 1899 2 January 1, 1900 The time portion of the serial number (to the right of the decimal point) can represent times that range from 0 (12.00.00 A.M.) to .99999 (11.59.59 P.M. or 23.59.59).