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- January 06, 2026 - M_io
- January 05, 2026 - M_strings
- January 05, 2026 - M_time
- December 03, 2025 - fortran-lang.org Standard Library
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Random Spotlight
M_time displays Civilian Calendar dates in many formats.
In addition to high-level date formatting, it can manipulate or read many other date representations ...
Julian and Modified Julian Dates
Baseday and Seconds Dates
Unix Epoch Dates
High-level date formatting
Ordinal days of the year
days of the week
ISO-8601 week numbers
month and weekday names
(limited) internationalization
Julian and Unix Epoch Dates are particularly useful for manipulating dates in simple numeric expressions. They are numbers with units of days and seconds respectively from a fixed date that you can easily convert to and from. So you can convert any date to a Julian Date, subtract one and you have the date for the day before, for example.
The M_time Fortran module complements the DATE_AND_TIME procedure ( it is the standard Fortran intrinsic subroutine that returns the current date and time in the Gregorian calendar). That is, the primary way this module represents dates is as an integer array with the same meaning for elements as defined by the DATE_AND_TIME routine.
The extensive formatting options include showing SYSTEM_CLOCK and CPU_USAGE information along with Gregorian date information, allowing for the easy incorporation of timing information into program messages.
In addition to conventional Civilian Calendar dates, the module supports the ISO-8601 standard.
Procedural, Functional, and OOP (Object Oriented Programming) interfaces are provided.
To link this library, add the flag:
-lm_time
to the Linker flags in Simply Fortran's Compiler Flags category of Project Options.
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