Two-digit year used to determine default century
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WSupported on Windows
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USupported on Unix
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VSupported on OpenVMS
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The SYNCENTURY environment variable defines a sliding window for Synergy/DE default century methods by specifying a two-digit year to be used as a defining point. Years prior to the specified year use one century, while years the same as or later than the specified year use a different century.
Value
A two-digit year in the range 00 – 99.
Discussion
UI Toolkit and ReportWriter enable you to define a method that is called whenever a default century is required. If no century method is registered but SYNCENTURY is defined, an internal century method is called. If SYNCENTURY is not defined or is invalid, Toolkit and xfODBC use the current system century, while ReportWriter uses 19 as the century for all dates stored in YYMMDD, YYJJJ, and YYPP formats.
The default century method used by Toolkit, ReportWriter, and xfODBC provides a sliding window whereby the default century for each side of the window is determined by SYNCENTURY and the current year. If the current two-digit year falls between 0 and SYNCENTURY, years between 0 and SYNCENTURY use the current system century, while years between SYNCENTURY (inclusive) and 99 use the previous century. If the current two-digit year falls between SYNCENTURY (inclusive) and 99, years between 0 and SYNCENTURY use the next century, while years between SYNCENTURY (inclusive) and 99 use the current system century.
The following table contains the translated four-digit year when SYNCENTURY is set to 50:
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Current year |
Year entered by user |
Translated four-digit year |
|---|---|---|
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1998 |
0 |
2000 |
|
1998 |
49 |
2049 |
|
1998 |
50 |
1950 |
|
1998 |
99 |
1999 |
|
2000 |
0 |
2000 |
|
2000 |
49 |
2049 |
|
2000 |
50 |
1950 |
|
2000 |
99 |
1999 |
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Selection and sorting of dates in YYMMDD, YYJJJ, or YYPP formats are not optimized if SYNCENTURY is set or if %RW_CENTURY_METHOD is specified. |
Setting location
For ReportWriter and UI Toolkit:
The environment. On Windows, this environment variable can also be set in the [synergy], [dbr], or [myprog] section of synergy.ini (where myprog is any .dbr file).
For xfODBC:
For standalone configurations, set SYNCENTURY in the connect file or in the environment. For client/server configurations, set it in the connect file on the server.
Used by
ReportWriter, UI Toolkit, xfODBC, fcompare
See also
- E_METHOD and %ECENTURY_METHOD routines for more information on providing your own century method for Toolkit
- Specifying a century for two-digit years for information on providing your own century method for ReportWriter with %RW_CENTURY_METHOD
Examples
On Windows, if set in the synergy.ini file,
[synergy] SYNCENTURY=50
