flags are used to control the additional feature switches of the log component. These properties are controlled by combining constants, including:

F_ASYNC      = 1 << iota // Enable asynchronous log output
F_FILE_LONG              // Print call line number information with a full absolute path, e.g., /a/b/c/d.go:23
F_FILE_SHORT             // Print call line number information, only the file name, e.g., d.go:23, overrides F_FILE_LONG.
F_TIME_DATE              // Print the current date, e.g., 2009-01-23
F_TIME_TIME              // Print the current time, e.g., 01:23:23
F_TIME_MILLI             // Print the current time + milliseconds, e.g., 01:23:23.675
F_TIME_STD = F_TIME_DATE | F_TIME_MILLI // (Default) Print the current date + time + milliseconds, e.g., 2009-01-23 01:23:23.675

Usage example:

package main

import (
    "context"

    "github.com/gogf/gf/v2/os/glog"
)

func main() {
    ctx := context.TODO()
    l := glog.New()
    l.SetFlags(glog.F_TIME_TIME | glog.F_FILE_SHORT)
    l.Print(ctx, "time and short line number")
    l.SetFlags(glog.F_TIME_MILLI | glog.F_FILE_LONG)
    l.Print(ctx, "time with millisecond and long line number")
    l.SetFlags(glog.F_TIME_STD | glog.F_FILE_LONG)
    l.Print(ctx, "standard time format and long line number")
}

After execution, the terminal output is:

PS C:\hailaz\test> go run .\main.go
16:05:35 main.go:13: time and short line number
16:05:35.108 C:/hailaz/test/main.go:15: time with millisecond and long line number
2022-01-05 16:05:35.109 C:/hailaz/test/main.go:17: standard time format and long line number