github.com/ardanlabs/timezone

timezone

import "github.com/ardanlabs/timezone"

• Overview
• Index
• Examples

Overview

Package timezone provides two ways to retrieve the timezone for any latitude,longitude position.

Google Time Zone API

https://developers.google.com/maps/documentation/timezone/

This API is free and limits you to 2,500 calls a day. You will receive a GoogleTimezone object if the call is successful.

// RetrieveGoogleTimezone calls the Google API to retrieve the timezone for the lat/lng
latitude: The latitude position of the location
longitude: The longitude position of the location

// RetrieveGoogleTimezone(latitude float64, longitude float64) (googleTimezone *GoogleTimezone, err error)
DstOffset:    Offset for daylight-savings time in seconds. This will be zero if the time zone is not in Daylight Savings Time during the specified timestamp.
RawOffset:    Offset from UTC (in seconds) for the given location. This does not take into effect daylight savings.
TimezoneID:   Contains the ID of the time zone, such as "America/Los_Angeles" or "Australia/Sydney".
TimezoneName: Contains the long form name of the time zone. This field will be localized if the language parameter is set. eg. "Pacific Daylight Time" or "Australian Eastern Daylight Time"
Status:       Indicates the status of the response.
	OK               : Indicates that the request was successful.
	INVALID_REQUEST  : Indicates that the request was malformed.
	OVER_QUERY_LIMIT : Indicates the requestor has exceeded quota.
	REQUEST_DENIED   : Indicates that the the API did not complete the request. Confirm that the request was sent over http instead of https.
	UNKNOWN_ERROR    : Indicates an unknown error.
	ZERO_RESULTS     : Indicates that no time zone data could be found for the specified position or time. Confirm that the request is for a location on land, and not over water.

GeoNames Time Zone API

http://www.geonames.org/

This API is free with registration and has no limit. If you upgrade to a premium account you can be guaranteed fast and reliable response times.

// RetrieveGeoNamesTimezone calls the GeoNames API to retrieve the timezone for the lat/lng
latitude: The latitude position of the location
longitude: The longitude position of the location
userName: The GeoNames username for using the API

// RetrieveGeoNamesTimezone(latitude float64, longitude float64, userName string) (geoNamesTimezone *GeoNamesTimezone, err error)
Time:        	The local current time.
CountryName: 	ISO 3166 country code name
CountryCode: 	ISO 3166 country code
Sunset:      	Current days time for sunset
RawOffset:   	The amount of time in hours to add to UTC to get standard time in this time zone.
DstOffset:   	Offset to GMT at 1. July (deprecated)
GmtOffset:   	Offset to GMT at 1. January (deprecated)
Sunrise:     	Current days time for sunrise
TimezoneID:  	The name of the timezone (according to olson).
Longitude:   	Longitude used for the call
Latitude:    	Latitude used for the call

Using The Time Package

The TimezoneID is a location name corresponding to the IANA Time Zone database. Go provides this database in the /lib/time/zoneinfo.zip file. Because of this we can use the TimezoneID within the time package:

// Take the timezone id from the API call and create a location object
var location *time.Location
location, err = time.LoadLocation(TimezoneID)

// Use the location object to make sure this time is in the correct timezone
localTime := time.Date(year, time.Month(month), day, hour, minute, 0, 0, location)

// Convert to UTC, if required, based on the correct timezone
utcTime := localTime.UTC()

Index

• type GeoNamesTimezone
  • func RetrieveGeoNamesTimezone(latitude float64, longitude float64, userName string) (geoNamesTimezone *GeoNamesTimezone, err error)
• type GoogleTimezone
  • func RetrieveGoogleTimezone(latitude float64, longitude float64) (googleTimezone *GoogleTimezone, err error)

Examples

• RetrieveGeoNamesTimezone
• RetrieveGoogleTimezone

Package files

doc.go timezone.go

type GeoNamesTimezone

type GeoNamesTimezone struct {
    Time        string  `bson:"time"`        // The local current time.
    CountryName string  `bson:"countryName"` // ISO 3166 country code name.
    CountryCode string  `bson:"countryCode"` // ISO 3166 country code.
    Sunset      string  `bson:"sunset"`      // Current days time for sunset.
    RawOffset   float64 `bson:"rawOffset"`   // The amount of time in hours to add to UTC to get standard time in this time zone.
    DstOffset   float64 `bson:"dstOffset"`   // Offset to GMT at 1. July (deprecated).
    GmtOffset   float64 `bson:"gmtOffset"`   // Offset to GMT at 1. January (deprecated).
    Sunrise     string  `bson:"sunrise"`     // Current days time for sunrise.
    TimezoneID  string  `bson:"timezoneID"`  // The name of the timezone (according to olson).
    Longitude   float64 `bson:"lng"`         // Longitude used for the call.
    Latitude    float64 `bson:"lat"`         // Latitude used for the call.
}

GeoNamesTimezone is the repsonse from the GeoNames timezone API.

func RetrieveGeoNamesTimezone

func RetrieveGeoNamesTimezone(latitude float64, longitude float64, userName string) (geoNamesTimezone *GeoNamesTimezone, err error)

RetrieveGeoNamesTimezone calls the GeoNames API to retrieve the timezone for the lat/lng.

type GoogleTimezone

type GoogleTimezone struct {
    DstOffset    float64 `bson:"dstOffset"`    // Offset for daylight-savings time in seconds. This will be zero if the time zone is not in Daylight Savings Time during the specified timestamp.
    RawOffset    float64 `bson:"rawOffset"`    // Offset from UTC (in seconds) for the given location. This does not take into effect daylight savings.
    Status       string  `bson:"status"`       // Indicates the status of the response.
    TimezoneID   string  `bson:"timeZoneID"`   // Contains the ID of the time zone, such as "America/Los_Angeles" or "Australia/Sydney".
    TimezoneName string  `bson:"timeZoneName"` // Contains the long form name of the time zone. This field will be localized if the language parameter is set. eg. "Pacific Daylight Time" or "Australian Eastern Daylight Time"
}

GoogleTimezone is the repsonse from the Google timezone API.

func RetrieveGoogleTimezone

func RetrieveGoogleTimezone(latitude float64, longitude float64) (googleTimezone *GoogleTimezone, err error)

RetrieveGoogleTimezone calls the Google API to retrieve the timezone for the lat/lng.

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