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→Check if the date valid
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=== Check if the date valid === | === Check if the date valid === | ||
* Excel: [https://support.office.com/en-us/article/WEEKDAY-function-60e44483-2ed1-439f-8bd0-e404c190949a?ui=en-US&rs=en-US&ad=US WEEKDAY function] <ref>[http://www.mrexcel.com/forum/excel-questions/322203-check-if-valid-date.html Check if a valid date?]</ref> | * Excel: [https://support.office.com/en-us/article/WEEKDAY-function-60e44483-2ed1-439f-8bd0-e404c190949a?ui=en-US&rs=en-US&ad=US WEEKDAY function] <ref>[http://www.mrexcel.com/forum/excel-questions/322203-check-if-valid-date.html Check if a valid date?]</ref> | ||
** legal results: {{kbd | key=1}} (Sunday) ~ {{kbd | key=7}} (Saturday) | |||
** illegal result: {{kbd | key= <nowiki>#VALUE!</nowiki>}} | |||
* PHP: [http://stackoverflow.com/questions/19271381/correctly-determine-if-date-string-is-a-valid-date-in-that-format php - Correctly determine if date string is a valid date in that format - Stack Overflow] | * PHP: [http://stackoverflow.com/questions/19271381/correctly-determine-if-date-string-is-a-valid-date-in-that-format php - Correctly determine if date string is a valid date in that format - Stack Overflow] | ||