On Thursday, 18 January 2024 at 23:43:13 UTC, Jonathan M Davis wrote:
On Thursday, January 18, 2024 4:26:42 PM MST zoujiaqing via Digitalmars-d- learn wrote:
```D
import std.datetime : Clock, format;
import std.stdio : writeln;

void main()
{
     auto currentTime = Clock.currTime;

auto formattedTime = currentTime.format("%Y-%m-%d %H:%M:%S");

     writeln("Formatted Time: ", formattedTime);
}
```

std.datetime does not currently support custom date/time formats. It only supports the ISO format, the ISO Extended format, and Boost's simple time format.

// e.g. 20240118T163806.5813052
auto iso = time.toISOString();

// e.g. 2024-01-18T16:38:06.5813052
auto isoExt = time.toISOExtString();

// e.g. 2024-Jan-18 16:38:06.5813052
auto boostSimple = time.toSimpleString();

So, if you want a different format, you'll either need to make one yourself by calling the various properties on SysTime and passing them to something like std.format's format to create a string, or there are several packages on https://code.dlang.org which have functions for doing custom date/time formatting.

- Jonathan M Davis

Thank you for your replay.

So shame! The standard library doesn't have date formatting.

for this example "2024-Jan-18 16:38:06.5813052"
Why use Jan? no 01?
International standards should all apply numbers.
like this:
2024-01-18 16:38:06.5813052


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