我需要將 (HH:mm) 格式的字符串轉(zhuǎn)換為本地時區(qū)，該字符串應(yīng)該是 UTC 時間。如何將當前日期添加到字符串并將其轉(zhuǎn)換為當?shù)貢r間。我嘗試過使用日歷String utcTimeString = "06:00";SimpleDateFormat sdf = new SimpleDateFormat("HH:mm", Locale.getDefault());sdf.setTimeZone(TimeZone.getTimeZone("UTC"));Calendar now = Calendar.getInstance(Locale.getDefault());now.setTime(sdf.parse(utcTimeString));
3 回答
慕慕森
TA貢獻1856條經(jīng)驗 獲得超17個贊
強烈建議您使用現(xiàn)代 API 來獲取日期、時間、時區(qū)、偏移量、日歷等：
java.time
這樣做，非常容易
解析你收到的時間
獲取當前日期和
將它們組合成具有特定時區(qū)的日期時間表示
看這個小例子：
public static void main(String[] args) {
// create a time object from the String
LocalTime localTime = LocalTime.parse("06:00", DateTimeFormatter.ofPattern("HH:mm"));
// print it once in an ISO format
System.out.println(localTime.format(DateTimeFormatter.ISO_TIME));
// receive the date of today
LocalDate today = LocalDate.now();
// then use the date and the time object to create a zone-aware datetime object
ZonedDateTime zdt = LocalDateTime.of(today, localTime).atZone(ZoneId.of("UTC"));
// print it
System.out.println(zdt.format(DateTimeFormatter.ISO_ZONED_DATE_TIME));
}
輸出是
06:00:00
2019-11-04T06:00:00Z[UTC]
您可以根據(jù)需要使用不同的DateTimeFormatters 進行格式化。
肥皂起泡泡
TA貢獻1829條經(jīng)驗 獲得超6個贊
嘗試如下所示。
public String getDateTimeInUTC(String yourTime){
Calendar cal = Calendar.getInstance();
SimpleDateFormat currentDate= new SimpleDateFormat("MMM dd, yyyy ");
String currentDateTime = currentDate.format(cal.getTime())+yourTime; // here concate your time with current date.
System.out.println("Current date with given time: "+currentDateTime);
SimpleDateFormat df = new SimpleDateFormat("MMM dd, yyyy HH:mm", Locale.ENGLISH);
df.setTimeZone(TimeZone.getTimeZone("UTC"));
Date date = null;
try {
date = df.parse(currentDateTime);
} catch (ParseException e) {
e.printStackTrace();
}
df.setTimeZone(TimeZone.getDefault());
String formattedDate = df.format(date);
return formattedDate;
}
getDateTimeInUTC像下面這樣調(diào)用
String strTime = "12:10"; // your string time in HH:mm format
String finalDateTime = getDateTimeInUTC(strTime);
System.out.println("Final date-time in UTC: "+finalDateTime);
輸出：
Current date with given time: Nov 04, 2019 12:10
Final date-time in UTC: Nov 04, 2019 18:10
素胚勾勒不出你
TA貢獻1827條經(jīng)驗 獲得超9個贊
您可以查看一下：
Calendar calendar = Calendar.getInstance();
calendar.setTime(new Date());
//change the format according to your need
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
//Here you say to java the initial timezone. This is the secret
sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
//Will print in UTC
System.out.println(sdf.format(calendar.getTime()));
//Here you set to your timezone
sdf.setTimeZone(TimeZone.getDefault());
//Will print on your default Timezone
System.out.println(sdf.format(calendar.getTime()));
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