I want to set the timezone when sending SMS by Twilio API.
I sent an SMS via API referring to the Twilio documentation.
It worked as expected except for one point.
When an SMS is received by a mobile phone, the time is displayed in GMT.
But I want to change the time display to local time. (I am in Japan and want to deliver SMS to Japanese people.)
I looked into the API documentation but couldn't find the item.
I hope I can get advice.
The following is an additional note.
An email has a time stamp in its "Date" header which can include time zone information.
When I received an SMS from twilio on my feature phone, I saw that the message timestamp was displayed as GMT instead of local time, and thought it was because the time zone was handled incorrectly.
I rearrange this issue.
I have two mobile phone,
one is a feature phone and the other is a smartphone (android).
They are contracted in Japan.
The phone number purchased through Twilio is in the US.
I sent SMS between these two phones and twilio to see how the timestamp of the received SMS is displayed.
0: sender -> recipient / delivery time -> time displayed on the receiving side
1: feature phone (JP) -> smartphone (JP) / 21:00 JST -> 21:00
2: smartphone (JP) -> feature phone (JP) / 21:00 JST -> 21:00
3: twilio (US) -> smartphone (JP) / 21:00 JST -> 21:00
They are OK. But...
4: twilio (US) -> feature phone (JP) / 21:00 JST -> 12:00
...this is not a favorable result.
I'm not sure what the difference between 3 and 4 is.
due to the function of the mobile phone?
due to processing by the SMS gateway?
After that I tried several models of other feature phones and confirmed that they all had the same result.
This is a feature limitation of feature phones unique to Japan and may not be solved.
