yyyy-MM-dd 和yyyy-mm-dd有什么区别?(100)

突然发现这2个还不一样.

具体在什么地方使用不同?formatdatetime('yyyy-mm-dd',date);formatdatetime('yyyy-MM-dd',date);结果一样~

delphi帮助里2个地方有说明Element Description d The one- or two-digit day. dd The two-digit day. Single-digit day values are preceded by a zero. ddd The three-character weekday abbreviation. dddd The full weekday name. h The one- or two-digit hour in 12-hour format. hh The two-digit hour in 12-hour format. Single-digit values are preceded by a zero. H The one- or two-digit hour in 24-hour format. HH The two-digit hour in 24-hour format. Single-digit values are preceded by a zero. m The one- or two-digit minute. mm The two-digit minute. Single-digit values are preceded by a zero. M The one- or two-digit month number. MM The two-digit month number. Single-digit values are preceded by a zero. MMM The three-character month abbreviation. MMMM The full month name. t The one-letter AM/PM abbreviation (that is, AM is displayed as "A"). tt The two-letter AM/PM abbreviation (that is, AM is displayed as "AM"). yy The last two digits of the year (that is, 2001 would be displayed as "01"). yyyy The full year (that is, 2001 would be displayed as "2001").//////第二个地方/////////////////Specifier Displaysc Displays the date using the format given by the ShortDateFormat global variable, followed by the time using the format given by the LongTimeFormat global variable. The time is not displayed if the date-time value indicates midnight precisely.d Displays the day as a number without a leading zero (1-31).dd Displays the day as a number with a leading zero (01-31).ddd Displays the day as an abbreviation (Sun-Sat) using the strings given by the ShortDayNames global variable.dddd Displays the day as a full name (Sunday-Saturday) using the strings given by the LongDayNames global variable.ddddd Displays the date using the format given by the ShortDateFormat global variable.dddddd Displays the date using the format given by the LongDateFormat global variable.e (Windows only) Displays the year in the current period/era as a number without a leading zero (Japanese, Korean and Taiwanese locales only).ee (Windows only) Displays the year in the current period/era as a number with a leading zero (Japanese, Korean and Taiwanese locales only).g (Windows only) Displays the period/era as an abbreviation (Japanese and Taiwanese locales only).gg (Windows only) Displays the period/era as a full name. (Japanese and Taiwanese locales only).m Displays the month as a number without a leading zero (1-12). If the m specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.mm Displays the month as a number with a leading zero (01-12). If the mm specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.mmm Displays the month as an abbreviation (Jan-Dec) using the strings given by the ShortMonthNames global variable.mmmm Displays the month as a full name (January-December) using the strings given by the LongMonthNames global variable.yy Displays the year as a two-digit number (00-99).yyyy Displays the year as a four-digit number (0000-9999).h Displays the hour without a leading zero (0-23).hh Displays the hour with a leading zero (00-23).n Displays the minute without a leading zero (0-59).nn Displays the minute with a leading zero (00-59).s Displays the second without a leading zero (0-59).ss Displays the second with a leading zero (00-59).z Displays the millisecond without a leading zero (0-999).zzz Displays the millisecond with a leading zero (000-999).t Displays the time using the format given by the ShortTimeFormat global variable.tt Displays the time using the format given by the LongTimeFormat global variable.am/pm Uses the 12-hour clock for the preceding h or hh specifier, and displays 'am' for any hour before noon, and 'pm' for any hour after noon. The am/pm specifier can use lower, upper, or mixed case, and the result is displayed accordingly.a/p Uses the 12-hour clock for the preceding h or hh specifier, and displays 'a' for any hour before noon, and 'p' for any hour after noon. The a/p specifier can use lower, upper, or mixed case, and the result is displayed accordingly.ampm Uses the 12-hour clock for the preceding h or hh specifier, and displays the contents of the TimeAMString global variable for any hour before noon, and the contents of the TimePMString global variable for any hour after noon./ Displays the date separator character given by the DateSeparator global variable.: Displays the time separator character given by the TimeSeparator global variable.'xx'/"xx" Characters enclosed in single or double quotes are displayed as-is, and do not affect formatting.

MM就是时间的月Month mm就是时间分拉Minute所以使用的时候要小心了，我一般是'YYYY-MM-DD'

mm Displays the month as a number with a leading zero (01-12).

看了一下MM The two-digit month number. Single-digit values are preceded by a zero. mm Displays the month as a number with a leading zero (01-12). If the mm specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.MM只用来表示月份~~~mm即可以表示月份，也可以表示分钟~当mm在分隔符'h'或者'hh'后面时，它表示分钟~~

两个地方关于小时的格式说明也不一样。hh Displays the hour with a leading zero (00-23).这里似乎没有提到12还是24小时格式的区分。hh The two-digit hour in 12-hour format. Single-digit values are preceded by a zero. HH The two-digit hour in 24-hour format. Single-digit values are preceded by a zero.

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yyyy-MM-ddHH:mm:ss

只有楼上正解

formatdatetime('yyyy-mm-dd',date);formatdatetime('yyyy-MM-dd',date);怎么个不一样 你把事件设好显示出现看看好了；很简单 一个循环就能搞定的！

学习学习

FormatDateTime的帮助DescriptionFormatDateTime formats the TDateTime value given by DateTime using the format given by Format.【 See Date-Time format strings 】for more information.关于【Date-Time format strings】的说明，注意下面有一句话。Date/Time format strings control the formatting of dates and times.DescriptionDate-Time Format Strings specify the formatting of date-time values (such as TDateTime) when they are converted to strings. Date-Time Format Strings are passed to formatting routines (such as FormatDateTime), and are also used to set certain global variables (such as ShortDateFormat).Date Time Format Strings are composed from specifiers that represent values to be inserted into the formatted string. Some specifiers (such as "d"), simply format numbers or strings. Other specifiers (such as "/") refer to locale-specific strings from global variables.In the following table, specifiers are given in lower case. Case is ignored in formats, except for the "am/pm" and "a/p" specifiers.【上面这句话的意思是，格式描述符是不考虑字母的大小写的，除了"am/pm" and "a/p"以外】按照这种说法，应该不会出现yyyy-mm-dd,yyyy-MM-dd两种表示方法，除非有人故意写着完。比如Delphi 对begin 是不考虑字母大小写的，如果出现begIn的写法，那一定是有的人写着完，本身是没有什么另外的意义的。Specifier Displaysc Displays the date using the format given by the ShortDateFormat global variable, followed by the time using the format given by the LongTimeFormat global variable. The time is not displayed if the date-time value indicates midnight precisely.d Displays the day as a number without a leading zero (1-31).dd Displays the day as a number with a leading zero (01-31).ddd Displays the day as an abbreviation (Sun-Sat) using the strings given by the ShortDayNames global variable.dddd Displays the day as a full name (Sunday-Saturday) using the strings given by the LongDayNames global variable.ddddd Displays the date using the format given by the ShortDateFormat global variable.dddddd Displays the date using the format given by the LongDateFormat global variable.e (Windows only) Displays the year in the current period/era as a number without a leading zero (Japanese, Korean and Taiwanese locales only).ee (Windows only) Displays the year in the current period/era as a number with a leading zero (Japanese, Korean and Taiwanese locales only).g (Windows only) Displays the period/era as an abbreviation (Japanese and Taiwanese locales only).gg (Windows only) Displays the period/era as a full name. (Japanese and Taiwanese locales only).m Displays the month as a number without a leading zero (1-12). If the m specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.mm Displays the month as a number with a leading zero (01-12). If the mm specifier immediately follows an h or hh specifier, the minute rather than the month is displayed.mmm Displays the month as an abbreviation (Jan-Dec) using the strings given by the ShortMonthNames global variable.mmmm Displays the month as a full name (January-December) using the strings given by the LongMonthNames global variable.yy Displays the year as a two-digit number (00-99).yyyy Displays the year as a four-digit number (0000-9999).h Displays the hour without a leading zero (0-23).hh Displays the hour with a leading zero (00-23).n Displays the minute without a leading zero (0-59).nn Displays the minute with a leading zero (00-59).s Displays the second without a leading zero (0-59).ss Displays the second with a leading zero (00-59).z Displays the millisecond without a leading zero (0-999).zzz Displays the millisecond with a leading zero (000-999).t Displays the time using the format given by the ShortTimeFormat global variable.tt Displays the time using the format given by the LongTimeFormat global variable.am/pm Uses the 12-hour clock for the preceding h or hh specifier, and displays 'am' for any hour before noon, and 'pm' for any hour after noon. The am/pm specifier can use lower, upper, or mixed case, and the result is displayed accordingly.a/p Uses the 12-hour clock for the preceding h or hh specifier, and displays 'a' for any hour before noon, and 'p' for any hour after noon. The a/p specifier can use lower, upper, or mixed case, and the result is displayed accordingly.ampm Uses the 12-hour clock for the preceding h or hh specifier, and displays the contents of the TimeAMString global variable for any hour before noon, and the contents of the TimePMString global variable for any hour after noon./ Displays the date separator character given by the DateSeparator global variable.: Displays the time separator character given by the TimeSeparator global variable.'xx'/"xx" Characters enclosed in single or double quotes are displayed as-is, and do not affect formatting.

为了防止出错月份用MM分钟用NN秒用SS毫秒用ZZZ

如何理解FormatDateTime的帮助中，In the following table, specifiers are given in lower case. Case is ignored in formats, except for the "am/pm" and "a/p" specifiers.【上面这句话的意思是，格式描述符是不考虑字母的大小写的，除了"am/pm" and "a/p"以外】

甘都要問？自己試下咪知咯。

MEMO1.LINES.ADD( formatdatetime('hh:nn:ss',strtodatetime('22:32:10'))); MEMO1.LINES.ADD( formatdatetime('HH:nn:ss',strtodatetime('22:32:10')));结果一样22:32:10，难道formatdatetime函数不能格式化成，12小时的格式10:32:10？

没有人会啊

接受答案了.