unix-timestamp

问题 I have a Unix timestamp like this: $timestamp=1330581600 How do I get the beginning of the day and the end of the day for that timestamp? e.g. $beginOfDay = Start of Timestamp's Day $endOfDay = End of Timestamp's Day I tried this: $endOfDay = $timestamp + (60 * 60 * 23); But I don't think it'll work because the timestamp itself isn't the exact beginning of the day. 回答1: strtotime can be used to to quickly chop off the hour/minutes/seconds $beginOfDay = strtotime("today", $timestamp);

问题 From a given date in %m-%d-%Y format we should determine what day it is Please help me with the command like if i pass a date like 09-01-2017 output should be Friday 回答1: DayOfWeek=$(date +%A) This would yield the day of week monday-sunday If your input date is strictly in the format MM-DD-YYYY , use the following IFS='-' read -ra ADDR <<< "09-01-2017" formattedDate=${ADDR[2]}-${ADDR[0]}-${ADDR[1]} date -d $formattedDate +%A The first line tokenizes the components of the date and the second

问题 From a given date in %m-%d-%Y format we should determine what day it is Please help me with the command like if i pass a date like 09-01-2017 output should be Friday 回答1: DayOfWeek=$(date +%A) This would yield the day of week monday-sunday If your input date is strictly in the format MM-DD-YYYY , use the following IFS='-' read -ra ADDR <<< "09-01-2017" formattedDate=${ADDR[2]}-${ADDR[0]}-${ADDR[1]} date -d $formattedDate +%A The first line tokenizes the components of the date and the second

问题 I am working with a data frame in R labeled "mydata". The first column, labled "ts" contains unix timestamp fields. I'd like to convert these fields to days of the week. I've tried using strptime and POSIXct functions but I'm not sure how to execute them properly: > strptime(ts, "%w") --Returned this error: "Error in as.character(x) : cannot coerce type 'closure' to vector of type 'character'" I also just tried just converting it to human-readable format with POSIXct: as.Date(as.POSIXct(ts,

问题 I have an X.509 certificate which has the following 2 timestamps: ['validFrom'] = String(13) "120314165227Z" ['validTo'] = String(13) "130314165227Z" What does the postfix character 'Z' mean. Does it specify the timezone? 回答1: Yes. 'Z' stands for Zulu time, which is also GMT and UTC. From http://en.wikipedia.org/wiki/Coordinated_Universal_Time: The UTC time zone is sometimes denoted by the letter Z—a reference to the equivalent nautical time zone (GMT), which has been denoted by a Z since

问题 get last sunday date as output from a given date (not current date) as input Example input: 08-30-2017 (%m-%d-%Y) output should be last sunday: 08-27-2017 === All of the below commands use current day as reference .But i want to give the reference date as input to get last sunday. Please help me with the command. date +%m-%d-%Y -d "2017-09-10 -7 days" date +%m-%d-%Y -d "last Sun" 回答1: If you deal with a fixed date format %m-%d-%Y , it should be transformed to %Y-%m-%d format to be processed

问题 I want to generate a list of files where the name consists of ${filename}.${date} , for example file.20111101 , file.20120703 , starting November 1, 2011 until today and it should exclude weekends. Thanks. 回答1: try this for 2011 for y in 2011; do for m in {1..12}; do for d in `cal -m $m $y|tail -n +3|cut -c 1-15`; do printf "file.%04d%02d%02d\n" $y $m $d; done; done; done or this for NOV-2011 to DEC-2013 for ym in {2011' '{11,12},{2012..2013}' '{1..12}}; do read y m <<<$ym; for d in `cal -m

问题 I'm using this code to determine when my iOS device last rebooted: int mib[MIB_SIZE]; size_t size; struct timeval boottime; mib[0] = CTL_KERN; mib[1] = KERN_BOOTTIME; size = sizeof(boottime); if (sysctl(mib, MIB_SIZE, &boottime, &size, NULL, 0) != -1) { return boottime.tv_sec; } return 0; I'm seeing some anomalies with this time. In particular, I save the long and days and weeks later check the saved long agains the value returned by the above code. I'm not sure, but I think I'm seeing some

问题 mysql> SELECT FROM_UNIXTIME(2145916799), FROM_UNIXTIME(2145916800), POW(2,32-1)-1, 2145916799 - POW(2,32-1)-1; +---------------------------+---------------------------+---------------+----------------------------+ | FROM_UNIXTIME(2145916799) | FROM_UNIXTIME(2145916800) | POW(2,32-1)-1 | 2145916799 - POW(2,32-1)-1 | +---------------------------+---------------------------+---------------+----------------------------+ | 2037-12-31 18:59:59 | NULL | 2147483647 | -1566850 | +---------------------

问题 These both correctly return the current UNIX timestamp: SELECT UNIX_TIMESTAMP(LOCALTIMESTAMP()); #MySql echo time(); //PHP But I'm storing UTC_TIMESTAMPs in my database (not LOCALTIMESTAMPs). How can I convert a UTC datetime to a UNIX timestamp using MySQL? 回答1: Note that LOCALTIMESTAMP() is a synonym for NOW(). So what you're really asking is how to get the current time and convert it to GMT and then convert to a unix timestamp to store in the db. So this will work: SELECT UNIX_TIMESTAMP