PTOOLDAT.INC   Copyright 1984  R D Ostrander
 Version 1.0
                                 Ostrander Data Services
                                 5437 Honey Manor Dr
                                 Indianapolis  IN  46241

 These Turbo Pascal functions are date manipulation tools used
 to Convert Gregorian date strings, Change Gregorian Dates to
 and from Julian dates, Find Day of Week, Add numbers to dates,
 Find the difference between dates, Convert dates to 2 byte
 integers in order to save disk storage, and to Retrieve the
 current (system) date. Handles date from 1/1/0100 to 12/31/9999.

 This program has been placed in the Public Domain by the author
 and copies may be freely made for non-commercial, demonstration,
 or evaluation purposes. Use of these subroutines in a program
 for sale or for commercial purposes in a place of business
 requires a $20 fee be paid to the author at the address above.
 Personal non-commercial users may also elect to pay the $20 fee
 to encourage further development of this and similar programs.
 With payment you will be able to receive update notices,
 diskettes and printed documentation of this and other PTOOLs
 from Ostrander Data Services.

 PTOOL, and PTOOLxxx are Copyright Trademarks of Ostrander Data
 Services

 Turbo Pascal is a Copyright of Borland International Inc.


Functions available in PTOOLDAT.INC are:

 PTDGValid - True if argument is valid Gregorian Date
 PTDJValid - True if argument is valid Julian Date
             (Note that this is useful for Julian types A & B
             (ANSI) only)
 PTDSValid - True if argument is valid Short format Date
 PTDGtoJ   - Convert argument (Gregorian Date) to a Julian Date
 PTDJtoG   - Convert argument (Julian Date) to a Gregorian Date
 PTDGtoG   - Convert argument (Gregorian Date in 2nd format)
             to Gregorian Date in standard (1st) format -
             Note that a blank (space filled) string returned
             if the argument cannot be converted
 PTDGtoS   - Convert argument (Gregorian Date to a Short format
             date. Return -32766 if not in range of January 1st
             of Base year thru June 1st, 179 years after the Base
             Year.
 PTDStoG   - Convert argument (Short format Date) to a Gregorian
             Date
 PTDJtoS   - Convert argument (Julian Date to a Short format date
 PTDStoJ   - Convert argument (Short format Date) to a Julian Date
 PTDGAdd   - Add argument-2 (Integer) number of days to argument-1
             (Gregorian Date) and express result in Gregorian
             format
 PTDJAdd   - Add argument-2 (Integer) number of days to argument-1
             (Julian Date) and express result in Julian format
 PTDGComp  - Subtract argument-2 (Gregorian Date) from argument-1
             (Gregorian Date) giving number of days between dates
             minus 1.
 PTDJComp  - Subtract argument-2 (Julian Date) from argument-1
             (Julian Date) giving number of days between dates
             minus 1
 PTDGLeap  - True if argument (Gregorian Date) is a Leap Year
 PTDJLeap  - True if argument (Julian Date) is a Leap Year
 PTDSLeap  - True if argument (Short format date) is a Leap Year
 PTDYLeap  - True if argument is a Leap Year
 PTDGDay   - Return Day of Week for argument (Gregorian Date)
 PTDJDay   - Return Day of Week for argument (Julian Date)
 PTDSDay   - Return Day of Week for argument (Short format date)
 PTDGCurr  - Current (system) Gregorian Date
 PTDJCurr  - Current (system) Julian Date
 PTDSCurr  - Current (system) Short format date