给定本地DateTime和lat / lon，如何确定NodeJ中的时区和偏移量？

Question

In the past I implemented C# library which, given local DateTime and lat/lon , allowed to determine a timezone and offset .

I did the following:

• downloaded shapefiles from efele.net/maps/tz
• imported them into SQL Server
• used them to get tzid from lat/lon

Noda Time C# library was used to get all necessary information about timezone, offset, and DST. It returns:

• Offset in minutes
• UTC DateTime
• Olson/IANA Timezone name
• Windows Timezone name
• bool IsDST

Now I need to reproduce this library in NodeJs + PostgreSQL. Is the suggested way of doing it:

• Import http://efele.net/maps/tz shapefiles to PostgreSQL
• Use Moment TimeZone library in NodeJs similar to how I used Noda Time in C#

Are there known pitfalls, difficulties?

Answer 1

As you said, you need some actualized shapefile to map all timezones by geo coordinates .

You can use a module like geo-tz that natively support moment-timezone library. Or a more lightweight one like tz-lookup .