Question

嗨，我想将UTC时间转换为本地时间，而我正在这样做

String formatStr1 = "yyyy-MM-dd_HH'h'mm'm'ss'sZ'";

由于od是Z，所以我得到了解析异常，但是当我这样做

from random import randint
import sys

def guessinggame():
    STOP = '='
    a = '>'
    b = '<'
    guess_count = 0
    lowest_number = 1
    gamecount = 0
    highest_number = 100
    while True: 
        guess = (lowest_number+highest_number)//2
        print("My guess is :", guess)
        user_guess = input("Is your number greater than,less than, or equal to: ")
        guess_count += 1
        if user_guess == STOP:
            break
        if user_guess == a:
            lowest_number = guess + 1            
        elif user_guess == b:
            highest_number = guess - 1
    print("Congrats on BEATING THE GAME! I did it in ", guess_count, "guesses")
    PLAY_AGAIN = input("Would you like to play again? y or n: ")
    yes = 'y'
    gamecount = 0
    no = 'n'
    if PLAY_AGAIN == yes:
        guessinggame()
        gamecount = gamecount + 1
    else:
        gamecount += 1
        print("thank you for playing!")
        print("You played", gamecount , "games")
        sys.exit(0)
    return guess_count, gamecount

print('Hello! What is your name?')
myname = input()

print('Well', myname, ', I want you to think of number in your head and I will guess it.')
print("---------------------------------------------------------------------------------")
print("RULES:                 if the number is correct simply input '='")
print("---------------------------------------------------------------------------------")
print("                  if YOUR number is GREATER then the output, input '>'")
print("---------------------------------------------------------------------------------")
print("                  if YOUR number is LESS then the output, input '<'")
print("---------------------------------------------------------------------------------")
print("                                ALRIGHT LETS PLAY")
print("---------------------------------------------------------------------------------")



guessinggame()
guess_count = guessinggame()
print(" it took me this many number of guesses: ", guess_count)


## each game the user plays is added one to it
## when the user wants to the game to stop they finish it and
## prints number of games they played as well as the average of guess it took
## it would need to take the number of games and add all the guesses together and divide it.

通过，这是否有效？难道不认为sZ是单个常量而不是Z是时区标记吗？

Answer 1

您正确的说，Z表示祖鲁时间，这是UTC的另一个名称。您可能还认为它是UTC的零偏移量。因此，您将需要解析Z作为偏移量，以确保正确解释您的时间。

java.time

但是，请勿使用SimpleDateFormat。众所周知，这很麻烦，而且已经过时了。也不要使用Date，它也已经过时，并且也存在设计问题。

    DateTimeFormatter formatter
            = DateTimeFormatter.ofPattern("uuuu-MM-dd_H'h'm'm's's'X");
    String timeStr1 = "2018-11-08_21h34m46sZ";
    Instant instant1 = formatter.parse(timeStr1, Instant::from);
    System.out.println(instant1);

输出：

2018-11-08T21：34：46Z

出于完整性考虑：

想要将…转换为当地时间

以美国/多伦多为例：

    ZonedDateTime dateTime = instant1.atZone(ZoneId.of("America/Toronto"));
    System.out.println(dateTime);

输出：

2018-11-08T16：34：46-05：00 [美国/多伦多]

在评论中您询问了Z：

如果我根本不包括它，那会有什么区别？

两件事：

您要确保字符串中包含所需的偏移量和对象（如果没有），否则您可能会导致错误忽略。称为输入验证。
如前所述，您想将Z解析为偏移量，否则就无法从解析后的值中提取明确的时间点。

链接： Oracle tutorial: Date Time解释了如何使用java.time。

SimpleDateFormat解析2018-11-08_21h34m46sZ

1 个答案:

java.time