数据编织日期格式为 GMT 时区，具有夏令时功能

Question

我正在尝试使用 GMT 时区进行日期格式化。但夏季和冬季的偏移量相同。它适用于CET时区。想知道为什么格林威治标准时间不同吗？

尝试了以下数据编织

期待

"GMT": 
"date-GMT-Winter": "2019-12-15T13:00:00+00:00",
"date-GMT-Summer": "2019-08-15T13:00:00+01:00"

但实际

"GMT": 
"date-GMT-Winter": "2019-12-15T13:00:00Z",
"date-GMT-Summer": "2019-08-15T13:00:00Z"

output application/json
var CET_timezone_winter = "2019-12-15T13:00:00" as DateTime >> "CET" as String {format: "xxx"}
var CET_timezone_summer = "2019-08-15T13:00:00" as DateTime >> "CET" as String {format: "xxx"}
var GMT_timezone_winter = "2019-12-15T13:00:00" as DateTime >> "GMT" as String {format: "xxx"}
var GMT_timezone_summer = "2019-08-15T13:00:00" as DateTime >> "GMT" as String {format: "xxx"}
---
{
'date2': now(),
"timeZoneOffset-xxx" : now() as String {format: "xxx"},

'CET':
{
'date-CET-Winter': CET_timezone_winter,
'date-CET-Summer': CET_timezone_summer
},
'GMT':
{
'date-GMT-Winter': GMT_timezone_winter,
'date-GMT-Summer': GMT_timezone_summer
}
}

Answer 1

夏令时不适用于GMT(或UTC(

请参阅 https://www.timeanddate.com/time/gmt-utc-time.html

UTC 和 GMT 都不会更改夏令时 (DST(。但是，一些使用 GMT 的国家/地区在 DST 期间切换到不同的时区。

例如，英国并非全年都使用格林尼治标准时间，它在夏季使用英国夏令时 (BST(，比格林尼治标准时间早一小时。

如果您尝试获取全年的英国/伦敦时间(格林威治标准时间和夏令时BST(，您可以使用以下Dataweave(我添加了新字段进行比较(

output application/json
var CET_timezone_winter = "2019-12-15T13:00:00" as DateTime >> "CET" as String {format: "xxx"}
var CET_timezone_summer = "2019-08-15T13:00:00" as DateTime >> "CET" as String {format: "xxx"}
var GMT_timezone_winter = "2019-12-15T13:00:00" as DateTime >> "GMT" as String {format: "xxx"}
var GMT_timezone_summer = "2019-08-15T13:00:00" as DateTime >> "GMT" as String {format: "xxx"}
var london_timezone_winter = "2019-12-15T13:00:00" as DateTime >> "Europe/London" as String {format: "xxx"}
var london_timezone_summer = "2019-08-15T13:00:00" as DateTime >> "Europe/London" as String {format: "xxx"}
---
{
'date2': now(),
"timeZoneOffset-xxx" : now() as String {format: "xxx"},

'CET':
{
'date-CET-Winter': CET_timezone_winter,
'date-CET-Summer': CET_timezone_summer
},
'GMT':
{
'date-GMT-Winter': GMT_timezone_winter,
'date-GMT-Summer': GMT_timezone_summer
},
'London': {
'date-London-Winter': london_timezone_winter,
'data-London-Summer': london_timezone_summer
}   
}

输出为 JSON：

{
"date2": "2019-09-24T15:25:17.574Z",
"timeZoneOffset-xxx": "+00:00",
"CET": {
"date-CET-Winter": "2019-12-15T14:00:00+01:00",
"date-CET-Summer": "2019-08-15T15:00:00+02:00"
},
"GMT": {
"date-GMT-Winter": "2019-12-15T13:00:00Z",
"date-GMT-Summer": "2019-08-15T13:00:00Z"
},
"London": {
"date-London-Winter": "2019-12-15T13:00:00Z",
"data-London-Summer": "2019-08-15T14:00:00+01:00"
}
}