The Google timezone API is displaying an inaccurate daylight saving offset

London now has an additional +1 hour of daylight saving time. I made a request to the Google timezone API for the London timezone, but unfortunately, it is not displaying the correct time.

https://maps.googleapis.com/maps/api/timezone/json?location=51.5072,-0.1275&timestamp=1331766000&key=[API_KEY]

The result returned by this query is as follows:

{
   "dstOffset" : 0,
   "rawOffset" : 0,
   "status" : "OK",
   "timeZoneId" : "Europe/London",
   "timeZoneName" : "Greenwich Mean Time"
}

Shouldn't the dstOffset be 3600 instead of 0??

I referred to the guidelines provided in Timezone documentation.

What could be causing this discrepancy? How can I retrieve the timezone information with accuracy regarding daylight saving time?

javascriptjsongoogle-mapstimezonegoogle-api

Answer №1

The timestamp provided (1331766000) corresponds to March 14, 2012 at 23:00:00 GMT, which likely did not have daylight saving time in effect (it typically starts on the last Sunday in March).

The correct value should be in seconds since January 1, 1970 at 00:00:00 UTC, which you can calculate using Date.now()/1000 since JavaScript time values are measured in milliseconds since the same epoch. For a specific date and time like June 24, 2014 at 13:15:34 UTC, the corresponding timestamp is 1403615734. Using this timestamp would result in the following:

{
   "dstOffset" : 3600,
   "rawOffset" : 0,
   "status" : "OK",
   "timeZoneId" : "Europe/London",
   "timeZoneName" : "British Summer Time"
}

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