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https://www.ibmmainframer.com/cobol-tutorial/cobol-subtract-statement/
COBOL - Subtract statement. The SUBTRACT statement subtracts one numeric item, or the sum of two or more numeric items, from one or more numeric items, and stores the result. The SUBTRACT statement is used to subtract numeric items. There are three formats which works slightly differently and is described below,
https://ibmmainframes.com/about55590.html
Rather than having COBOL do the DATE-TIME arithmetic why don't you let DB2 do the DATE-TIME arithmetic for you.. Code: SELECT CURRENT TIMESTAMP AS TIME_NOW, CURRENT TIMESTAMP - 4 HOUR AS TIME_NOW_MINUS_4_HOURS FROM SYSIBM.SYSDUMMY1
https://www.ibm.com/docs/ssw_ibm_i_72/rzasb/sd.htm
The SUBTRACT-DURATION function subtracts a duration from a date, time, or timestamp item, and returns the modified item. The function type is date-time. The length of the return value depends on the length of the date, time, or timestamp item specified in argument-1. The returned value will be truncated to the length of argument-1.
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FUNCTION SUBTRACT-DURATION is not a valid COBOL FUNCTION, regardless of the COBOL version/release. When you say you need the "previous system-date", what is the amount of time do you need to subtract from the current-date? Minutes, Hours, Days, etc? We're all unsure. To use the supported COBOL FUNCTION's, check out - 01) FUNCTION CURRENT-DATE
https://www.tutorialride.com/cobol/subtract-verb-in-cobol.htm
Subtract Verb in COBOL - Tutorial to learn Subtract Verb in COBOL in simple, easy and step by step way with syntax, examples and notes.
https://riptutorial.com/cobol/topic/7465/subtract-statement
The SUBTRACT statement is used to subtract one, or the sum of two or more, numeric data items from one or more items, and set the values of one or more identifiers to the result. rounded-phrase. SUBTRACT example. PDF - Download cobol for free. Previous Next.
https://support.microsoft.com/en-us/office/add-or-subtract-time-16aa6697-6d6e-49c1-8e2c-3398a7cad6ad
In cell D2, subtract the end time from the start time by entering the formula =C2-B2, and then press Enter. In the Format Cells box, click Custom in the Category list. In the Type list, click h:mm (for hours and minutes), and then click OK. Now we …
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