什么是相当有效但最重要的是生成UTC时间戳作为长值(java原始类型)的简洁方法。
我只需要精确到最精确的毫秒值。
我更喜欢使用java.time.ZonedDateTime,因为它是一种获取UTC时间戳的简洁方法,并且不需要任何我不想使用的外部日期库,如Joda或Apache。
包含原始长值的19个数字将按照以下示例进行细分(格式化):
2015 - 4 digit year with range 1000 - 9223.
- no zero padding allowed to ensure length is always
a 19 digit long value
- 1000 is the minimum value of a four digit year
- 9223 is the maximum value based on first four digits
of Long.MAX_VALUE or 9223372036854775807
01 - 2 digit month with range 01 - 12
- zero padded to ensure 2 digits always
- jan is 01 and dec is 12
20 - 2 digit day with range 01 - 31
- zero padded to ensure 2 digits always
07 - 2 digit hour with range 00 - 23
- zero padded to ensure 2 digits always
- uses a 24 hour clock
- 00 is 12 AM while 23 is 11 PM
00 - 2 digit minute with range 00 - 59
- zero padded to ensure 2 digits always
00 - 2 digit second with range 00 - 59
- zero padded to ensure 2 digits always
999 - 3 digit milliseconds with range 000 - 999
- zero padded to ensure 3 digits always
99 - only 2 digits left over from primitive long. Ignore these as they
will be used internally as specialized counters within my program
我的出发点是使用以下内容:
ZonedDateTime value = ZonedDateTime.now( ZoneOffset.UTC );
答案 0 :(得分:4)
ZonedDateTime value = ZonedDateTime.now(ZoneOffset.UTC);
System.out.println(value.get(ChronoField.NANO_OF_SECOND));
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyyMMddHHmmssSSS");
long time = Long.parseLong(formatter.format(value)) * 100;
System.out.println(time);