Added changes for ls-l time support

[Biancaa-R]

Fixes the issue : apache/nuttx#17063

a) modification aims to add human-readable timestamp reporting to the ls command by utilizing the struct stat information.
b) time_t st_mtime; / Time of last modification / from stat register to maintain time records.
c) Epoch entries replaced by ---.
d) ls -l (without options) implementation done here.

Note: Please adhere to Contributing Guidelines.

Summary

• So basically displaying the last modified time that is stored in the stat struct in ls -l command.
• stat(fullpath, &buf): This fills the buf structure with metadata from the filesystem.
• buf.st_mtime: This specifically targets the "Last Modified" timestamp.
• Safety Check: if (ret == 0 && buf.st_mtime > 0 ...) ensures that the stat call was successful and that the time value is valid before trying to process it.
• localtime_r(&t, &tm): This takes the Unix epoch time (seconds since 1970) and breaks it down into a struct tm (years, months, days, etc.).
• Formatting: %04d-%02d-%02d, which outputs the ISO 8601 standard (e.g., 2023-10-27).

Impact

Previously the ls -l didnt display the time of last modification , this is a small fix for more "linux like" experience.

Testing

• Apache NuttX Simulation Mode allows you to run the OS as a native Linux process.
• Building and running it and executing the ls -l command in the shell.

[cederom]

Thank you @Biancaa-R :-) Can you please provide output of ls -l command from Linux/Unix shell and ls -l from nsh after your change? Are these outputs comparable for parse (i.e. information order) :-)

[linguini1]

Hi! To fix the CI errors, please run ./tools/checkpatch.sh on your changes and fix the issues.

[cederom]

CI build failed.

[simbit18]

@Biancaa-R @cederom, this is the error `flash' overflowed by 4 bytes

====================================================================================
Configuration/Tool: weact-stm32h750/nsh,CONFIG_ARM_TOOLCHAIN_CLANG
2026-02-19 20:01:01
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_CLANG
  Building NuttX...
arm-none-eabi-ld: /github/workspace/sources/nuttx/nuttx section `.data' will not fit in region `flash'
arm-none-eabi-ld: region `flash' overflowed by 4 bytes
make[1]: *** [Makefile:217: nuttx] Error 1
make: *** [tools/Unix.mk:552: nuttx] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize weact-stm32h750/nsh
On branch master
Your branch is up to date with 'origin/master'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	boards/arm/stm32h7/weact-stm32h750/scripts/flash.ld.tmp

nothing added to commit but untracked files present (use "git add" to track)
====================================================================================

[Biancaa-R]

@Biancaa-R @cederom, this is the error `flash' overflowed by 4 bytes

====================================================================================
Configuration/Tool: weact-stm32h750/nsh,CONFIG_ARM_TOOLCHAIN_CLANG
2026-02-19 20:01:01
------------------------------------------------------------------------------------
  Cleaning...
  Configuring...
  Disabling CONFIG_ARM_TOOLCHAIN_GNU_EABI
  Enabling CONFIG_ARM_TOOLCHAIN_CLANG
  Building NuttX...
arm-none-eabi-ld: /github/workspace/sources/nuttx/nuttx section `.data' will not fit in region `flash'
arm-none-eabi-ld: region `flash' overflowed by 4 bytes
make[1]: *** [Makefile:217: nuttx] Error 1
make: *** [tools/Unix.mk:552: nuttx] Error 2
make: Target 'all' not remade because of errors.
/github/workspace/sources/nuttx/tools/testbuild.sh: line 385: /github/workspace/sources/nuttx/../nuttx/nuttx.manifest: No such file or directory
  [1/1] Normalize weact-stm32h750/nsh
On branch master
Your branch is up to date with 'origin/master'.

Untracked files:
  (use "git add <file>..." to include in what will be committed)
	boards/arm/stm32h7/weact-stm32h750/scripts/flash.ld.tmp

nothing added to commit but untracked files present (use "git add" to track)
====================================================================================

is // Instead of: " %04d-%02d-%02d %02d:%02d"
nsh_output(vtbl, " %d-%d-%d", tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday);
better ? @simbit18 ? I think that is causing the overflow..

[cederom]

this looks ai generated without understanding. do we have more time to play?

[Biancaa-R]

this looks ai generated without understanding. do we have more time to play?

Im sorry Ill check the dump and come back..