UTC時間格式有很多，需要辨清自己是屬于哪種格式，否則會出錯
/* RFC 1123 with 2-digit Year */"EEE, dd MMM yy HH:mm:ss z",
/* RFC 1123 with 4-digit Year */"EEE, dd MMM yyyy HH:mm:ss z",
/* RFC 1123 with no Timezone */"EEE, dd MMM yy HH:mm:ss",
/* Variant of RFC 1123 */"EEE, MMM dd yy HH:mm:ss",
/* RFC 1123 with no Seconds */"EEE, dd MMM yy HH:mm z",
/* Variant of RFC 1123 */"EEE dd MMM yyyy HH:mm:ss",
/* RFC 1123 with no Day */"dd MMM yy HH:mm:ss z",
/* RFC 1123 with no Day or Seconds */"dd MMM yy HH:mm z",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ssZ",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss'Z'",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:sszzzz",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss z",
/* ISO 8601 */"yyyy-MM-dd'T'HH:mm:ssz",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss.SSSz",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HHmmss.SSSz",
/* ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss",
/* ISO 8601 w/o seconds */"yyyy-MM-dd'T'HH:mmZ",
/* ISO 8601 w/o seconds */"yyyy-MM-dd'T'HH:mm'Z'",
/* RFC 1123 without Day Name */"dd MMM yyyy HH:mm:ss z",
/* RFC 1123 without Day Name and Seconds */"dd MMM yyyy HH:mm z",
/* Simple Date Format */"yyyy-MM-dd",
/* Simple Date Format */"MMM dd, yyyy"};
UTC時間是世界時間，北京時間應在UTC時間+上8小時
- 格式: 2019-05-21T08:44:00Z
public static void main(String[] args) throws Exception{
Date date = null;
// ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss'Z'",
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
// 2019-05-21T08:44:00Z 對應的時間格式 yyyy-MM-dd'T'HH:mm:ss'Z'
date = sdf.parse("2019-05-21T08:44:00Z");
System.out.println("UTC時間："+date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.HOUR,calendar.get(Calendar.HOUR)+8);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date1 = calendar.getTime();
String date2 = simpleDateFormat.format(calendar.getTime());
System.out.println("北京時間："+date2);
}
- 格式: 2020-09-18T06:44:32.552Z
public static void main(String[] args) throws Exception{
Date date = null;
// ISO 8601 slightly modified */"yyyy-MM-dd'T'HH:mm:ss.SSS'Z'",
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
// 2020-09-18T06:44:32.552Z 對應的時間格式 yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
date = sdf.parse("2020-09-18T06:44:32.552Z");
System.out.println("UTC時間："+date);
Calendar calendar = Calendar.getInstance();
calendar.setTime(date);
calendar.set(Calendar.HOUR,calendar.get(Calendar.HOUR)+8);
SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
Date date1 = calendar.getTime();
String date2 = simpleDateFormat.format(calendar.getTime());
System.out.println("北京時間："+date2);
}
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