Learn complete time package in Go

package main 

import (
    "fmt"
    "time"
)

func main() {
    p := fmt.Println //just to make things easy
    currtime := time.Now()

    p("current time: ", currtime)
    p("Year: ", currtime.Year())
    p("Month: ", currtime.Month())// prints the month in string format
    p("Day: ", currtime.Day())
    p("Hour: ", currtime.Hour())
    p("Minute: ", currtime.Minute())
    p("Second: ", currtime.Second())
    p("Nanosecond: ", currtime.Nanosecond())
    p("Location: ", currtime.Location())
    p(currtime.Zone()) // prints zone like "IST" 


    //let's print which day it is
    p("__day: ", currtime.Weekday())

    //let's print which week it is 
    p(currtime.ISOWeek())


    //creating a custom time using time.Date function
    pasttime := time.Date(2021, 8, 15, 14, 30, 45, 100 , time.Local)
    p(pasttime)

    //formatting time using Format function
    p(pasttime.Format("2006:01:02 03:04:05 pm"))

    //using the RFC3339 format 
    p(pasttime.Format(time.RFC3339Nano))

    //let's compare both the time current time and past time
    p(pasttime.Before(currtime))// should be true
    p(pasttime.Equal(currtime))// should be false
    p(pasttime.After(currtime))// should be false

    //let's find the difference in time
    diff := currtime.Sub(pasttime)
    p("difference in time: ", diff)
    p("hour difference : ", diff.Hours())
    p("Minute difference: ",diff.Minutes())
    p("Second difference: ",diff.Seconds())
    p("Nanosecond difference: ",diff.Nanoseconds())

    p(pasttime.Add(diff))// should get currtime
    p(currtime.Add(-diff))// should get pasttime

    unixSeconds := currtime.Unix()// this is the elapsed time since Unix epoch in seconds
    unixMilli := currtime.UnixMilli()// same ^ but in milliseconds
    unixNano := currtime.UnixNano()// same in nanoseconds

    p(unixSeconds)
    p(unixMilli)
    p(unixNano)

    //let's convert unix time to *time.Time
    p(time.Unix(unixSeconds, 0))
    p(time.UnixMilli(unixMilli))
    p(time.Unix(0, unixNano))

    // UTC is the standard time zone which is used in applications
    utcTime:= currtime.UTC()
    p("UTC time is: ", utcTime)

    // to convert it back to Local time
    localTime := utcTime.Local()
    p("The local time is: ", localTime)

}

current time:  2025-07-29 20:50:54.367091 +0530 IST m=+0.000511001
Year:  2025
Month:  July
Day:  29
Hour:  20
Minute:  50
Second:  54
Nanosecond:  367091000
Location:  Local
IST 19800
__day:  Tuesday
2025 31
2021-08-15 14:30:45.0000001 +0530 IST
2021:08:15 02:30:45 pm
2021-08-15T14:30:45.0000001+05:30
true
false
false
difference in time:  34662h20m9.3670909s
hour difference :  34662.335935303025
Minute difference:  2.0797401561181818e+06
Second difference:  1.247844093670909e+08
Nanosecond difference:  124784409367090900
2025-07-29 20:50:54.367091 +0530 IST
2021-08-15 14:30:45.0000001 +0530 IST m=-124784409.366579899
1753802454
1753802454367
1753802454367091000
2025-07-29 20:50:54 +0530 IST
2025-07-29 20:50:54.367 +0530 IST
2025-07-29 20:50:54.367091 +0530 IST
UTC time is:  2025-07-29 15:20:54.367091 +0000 UTC
The local time is:  2025-07-29 20:50:54.367091 +0530 IST