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diff --git a/content/posts/golang-format-date-and-time.md b/content/posts/golang-format-date-and-time.md new file mode 100644 index 0000000..44a4156 --- /dev/null +++ b/content/posts/golang-format-date-and-time.md @@ -0,0 +1,76 @@ +--- +title: 'Golang: Format Date and Time' +description: "Most programming languages use the same layout (dd-mm-yyyy) to format date and time, but Go decided to go a different route. Below is a little cheat sheet of how to format date and time in Go." +date: 2021-08-13T00:00:00+01:00 +tags: ['go', 'golang'] +draft: false +--- + +Most programming languages use the same layout (dd-mm-yyyy) to format date and time, but Go decided to go a different route. Below is a little cheat sheet of how to format date and time in Go. + +<!--more--> + +## Examples + +### Parsing exisiting date + +```go +var ( + timeToParse = "2021-09-13T07:43:52.823" + layout = "2006-01-02T03:04:05.999" +) + +toTime, _ := time.Parse(layout, timeToParse) + +fmt.Printf("(%T): %s\n", toTime, toTime) + +// output: (time.Time): 2021-09-13 07:43:52.823 +0000 UTC +``` + +### Formatting date + +```go +now := time.Now() +fmt.Println("Default:", now) +fmt.Println("Formatted:", now.Format("02-01-2006 15:04:05 -0700 MST")) + +// output: Default: 2021-08-13 09:01:29.233757 +0200 CEST m=+0.000065018 +// output: Formatted: 13-08-2021 09:01:29 +0200 CEST +``` + +## Options + +| Type | Options | +| :------- | :---------------------------- | +| Year | 06 2006 | +| Month | 01 1 Jan January | +| Day | 02 2 \_2 | +| Weekday | Mon Monday | +| Hours | 03 3 15 | +| Minutes | 04 4 | +| Seconds | 05 5 | +| ms μs ns | .000 .000000 .000000000 | +| ms μs ns | .999 .999999 .999999999 | +| am / pm | PM pm | +| Timezone | MST | +| Offset | -0700 -07 -07:00 Z0700 Z07:00 | + +## Predefined layouts + +| Name | Layout | +| :---------- | :----------------------------------------------------------- | +| ANSIC | Mon Jan \_2 15:04:05 2006 | +| UnixDate | Mon Jan \_2 15:04:05 MST 2006 | +| RubyDate | Mon Jan 02 15:04:05 -0700 2006 | +| RFC822 | 02 Jan 06 15:04 MST | +| RFC822Z | 02 Jan 06 15:04 -0700 // RFC822 with numeric zone | +| RFC850 | Monday, 02-Jan-06 15:04:05 MST | +| RFC1123 | Mon, 02 Jan 2006 15:04:05 MST | +| RFC1123Z | Mon, 02 Jan 2006 15:04:05 -0700 // RFC1123 with numeric zone | +| RFC3339 | 2006-01-02T15:04:05Z07:00 | +| RFC3339Nano | 2006-01-02T15:04:05.999999999Z07:00 | +| Kitchen | 3:04PM | +| Stamp | Jan \_2 15:04:05 | +| StampMilli | Jan \_2 15:04:05.000 | +| StampMicro | Jan \_2 15:04:05.000000 | +| StampNano | Jan \_2 15:04:05.000000000 | |