SQLite的日期操作: SQLite支持五中日期时间函数,如下: 1. date(timestring,modifier,...) 2. time(timestring,...) 3. datetime(timestring,...) 4. julianday(timestring,...) 5. strftime(format,timestring,...) strftime时间字串格式化 %d day of month: 00 %f fractional seconds: SS.SSS %H hour: 00-24 %j day of year: 001-366 %J Julian day number %m month: 01-12 %M minute: 00-59 %s seconds since 1970-01-01 %S seconds: 00-59 %w day of week 0-6 with Sunday==0 %W week of year: 00-53 %Y year: 0000-9999 %%% 以下结果是等价的 date(...) <---> strftime('%Y-%m-%d',...) time(...) <---> strftime('%H:%M:%S',...) datetime(...) <---> strftime('%Y-%m-%d %H:%M:%S',...) julianday(...) <---> strftime('%J',...) 再看看修饰符: 1. NNN days --加或减N天 2. NNN hours ----加或减N小时 3. NNN minutes --加或减N分钟 4. NNN.NNNN seconds ----加或减N秒 5. NNN months --加或减N月 6. NNN years --加或减N年 7. start of month --一月的开始的时间 8. start of year --一年开始的时间 9. start of day --一天开始的时间 10. weekday N --查看本周礼拜N是那天,1,2,3,4,5,6,0分别代表礼拜一到礼拜天,礼拜天最大 11. unixepoch 12. localtime --取本地时间 13. utc 例子: Compute the current date. SELECT date('now'); Compute the last day of the current month. SELECT date('now','start of month','+1 month','-1 day'); Compute the date and time given a unix timestamp 1092941466. SELECT datetime(1092941466,'unixepoch'); Compute the date and time given a unix timestamp 1092941466,and compensate for your local timezone. SELECT datetime(1092941466,'unixepoch','localtime'); Compute the current unix timestamp. SELECT strftime('%s','now'); Compute the number of days since the signing of the US Declaration of Independence. SELECT julianday('now') - julianday('1776-07-04'); Compute the number of seconds since a particular moment in 2004: SELECT strftime('%s','now') - strftime('%s','2004-01-01 02:34:56'); Compute the date of the first Tuesday in October for the current year. SELECT date('now','start of year','+9 months','weekday 2'); Compute the time since the unix epoch in seconds (like strftime('%s','now') except includes fractional part): SELECT (julianday('now') - 2440587.5)*86400.0;
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