How can I convert a timestamp (number of milliseconds since 1 Jan 1970..., aka epoch) to Date or DateTime format in Erlang? Something like {Year,Month,Day}.
Roughly:
msToDate(Milliseconds) ->
BaseDate = calendar:datetime_to_gregorian_seconds({{1970,1,1},{0,0,0}}),
Seconds = BaseDate + (Milliseconds div 1000),
{ Date,_Time} = calendar:gregorian_seconds_to_datetime(Seconds),
Date.
It just so happens that I have a github gist with a bunch of datetime utilities for exactly this purpose: http://gist.github.com/104903. Calendar has most of the low level plumbing for this stuff.
-module(date_util).
-compile(export_all).
epoch() ->
now_to_seconds(now())
.
epoch_hires() ->
now_to_seconds_hires(now())
.
now_to_seconds({Mega, Sec, _}) ->
(Mega * 1000000) + Sec
.
now_to_milliseconds({Mega, Sec, Micro}) ->
now_to_seconds({Mega, Sec, Micro}) * 1000
.
now_to_seconds_hires({Mega, Sec, Micro}) ->
now_to_seconds({Mega, Sec, Micro}) + (Micro / 1000000)
.
now_to_milliseconds_hires({Mega, Sec, Micro}) ->
now_to_seconds_hires({Mega, Sec, Micro}) * 1000
.
epoch_gregorian_seconds() ->
calendar:datetime_to_gregorian_seconds({{1970,1,1}, {0,0,0}})
.
now_to_gregorian_seconds() ->
epoch_to_gregorian_seconds(now())
.
epoch_to_gregorian_seconds({Mega, Sec, Micro}) ->
epoch_to_gregorian_seconds(now_to_seconds({Mega, Sec, Micro}));
epoch_to_gregorian_seconds(Now) ->
EpochSecs = epoch_gregorian_seconds()
, Now + EpochSecs
.
gregorian_seconds_to_epoch(Secs) ->
EpochSecs = epoch_gregorian_seconds()
, Secs - EpochSecs
.
date_to_epoch(Date) ->
datetime_to_epoch({Date, {0,0,0} })
.
datetime_to_epoch({Date, Time}) ->
gregorian_seconds_to_epoch(
calendar:datetime_to_gregorian_seconds({Date, Time}))
.
is_older_by(T1, T2, {days, N}) ->
N1 = day_difference(T1, T2)
, case N1 of
N2 when (-N < N2) ->
true;
_ ->
false
end
.
is_sooner_by(T1, T2, {days, N}) ->
case day_difference(T1, T2) of
N1 when N > N1 ->
true;
_ ->
false
end
.
is_time_older_than({Date, Time}, Mark) ->
is_time_older_than(calendar:datetime_to_gregorian_seconds({Date, Time})
, Mark);
is_time_older_than(Time, {DateMark, TimeMark}) ->
is_time_older_than(Time
, calendar:datetime_to_gregorian_seconds({DateMark, TimeMark}));
is_time_older_than(Time, Mark) when is_integer(Time), is_integer(Mark) ->
Time < Mark
.
day_difference({D1, _}, D2) ->
day_difference(D1, D2);
day_difference(D1, {D2, _}) ->
day_difference(D1, D2);
day_difference(D1, D2) ->
Days1 = calendar:date_to_gregorian_days(D1)
, Days2 = calendar:date_to_gregorian_days(D2)
, Days1 - Days2
.
is_time_sooner_than({Date, Time}, Mark) ->
is_time_sooner_than(calendar:datetime_to_gregorian_seconds({Date, Time})
, Mark);
is_time_sooner_than(Time, {DateMark, TimeMark}) ->
is_time_sooner_than(Time
, calendar:datetime_to_gregorian_seconds({DateMark, TimeMark}));
is_time_sooner_than(Time, Mark) when is_integer(Time), is_integer(Mark) ->
Time > Mark
.
subtract(Date, {days, N}) ->
New = calendar:date_to_gregorian_days(Date) - N
, calendar:gregorian_days_to_date(New)
.
add(Date, {days, N}) ->
New = calendar:date_to_gregorian_days(Date) + N
, calendar:gregorian_days_to_date(New)
.
OTP 21.0 added this function
calendar:system_time_to_universal_time(Time, TimeUnit) -> datetime()
Types
Time = integer()
TimeUnit = erlang:time_unit()
Converts a specified system time into universal date and time.
Example:
> os:system_time(1000).
1598512151718
> calendar:system_time_to_universal_time(1598512151718, 1000).
{{2020,8,27},{7,9,11}}
Refrence: https://erlang.org/doc/man/calendar.html#system_time_to_universal_time-2
Related
I want to achieve the following in my code, and can't seem to find a proper solution:
I need code that will always show 6 digits of a number, no matter being int greater than 999999 or floating point smaller than 0.
100000 -> 100000
1000000 -> 100000
10000.0 -> 10000
100.01111 -> 100.011
0.000001 -> 0
0.000011 -> 0.00001
With some help in the comments, I got a solution that works for me. If someone has more elegant way of doing this please do share it.
int desiredPrecision = 6;
int numberOfDigitsOnTheLeft = val.toInt().toString().length;
String sixDigitString = val.toStringAsFixed(desiredPrecision-numberOfDigitsOnTheLeft);
as an option
void main() {
print(_normalizeNum(10000.0));
print(_normalizeNum(100000));
print(_normalizeNum(1000000));
print(_normalizeNum(10000.0));
print(_normalizeNum(100.01111));
print(_normalizeNum(0.000001));
print(_normalizeNum(0.000011));
}
String _normalizeNum(num d) {
d = d.clamp(double.negativeInfinity, 999999);
d = num.parse(d.toStringAsFixed(6).substring(0, 7));
if (d == d.toInt()) {
d = d.toInt();
}
return d.toString();
}
Is it possible to convert a date, say it is in minutes to another format using SwiftDate library? For example:
77 minutes = 1 hour, 17 minutes
Why not to use this library? You can import NSDateTimeAgo.bundle and NSDate+Extension.swift. And to convert your timestamp to lets say 1 hour, 17 minutes you can do like this:
let timestamp = //timestamp or time
let date = Date(timeIntervalSince1970: timestamp!)
let timeAgo = date.timeAgo
print(timeAgo)
I am suggesting you this because it is more lightweight. And if you do not need the "ago" then you can remove those from NSDateTimeAgo.string file.
But you can also do it without any library like this eg with seconds:
func secondsToHoursMinutesSeconds (seconds : Int) -> (Int, Int, Int) {
return (seconds / 3600, (seconds % 3600) / 60, (seconds % 3600) % 60)
}
func secondsToHoursMinutesSeconds (seconds:Int) -> () {
let (h, m, s) = secondsToHoursMinutesSeconds (seconds: seconds)
print ("\(h) Hours, \(m) Minutes, \(s) Seconds")
}
secondsToHoursMinutesSeconds(seconds: 3000)// it would print 0 Hours, 50 Minutes, 0 Seconds
You can also suit it for your needs(this code is from this answer).
I want to convert Java 8 LocalDateTime to nearest 5 minutes. E.g.
1601 -> 1605
1602 -> 1605
1603 -> 1605
1604 -> 1605
1605 -> 1605
1606 -> 1610
1607 -> 1610
1608 -> 1610
1609 -> 1610
1610 -> 1610
I would like to use existing functionality of LocalDateTime or Math api. Any suggestions?
You can round towards the next multiple of five minutes using:
LocalDateTime dt = …
dt = dt.withSecond(0).withNano(0).plusMinutes((65-dt.getMinute())%5);
You can reproduce your example using
LocalDateTime dt=LocalDateTime.now().withHour(16).withSecond(0).withNano(0);
for(int i=1; i<=10; i++) {
dt=dt.withMinute(i);
System.out.printf("%02d%02d -> ", dt.getHour(), dt.getMinute());
// the rounding step:
dt=dt.plusMinutes((65-dt.getMinute())%5);
System.out.printf("%02d%02d%n", dt.getHour(), dt.getMinute());
}
→
1601 -> 1605
1602 -> 1605
1603 -> 1605
1604 -> 1605
1605 -> 1605
1606 -> 1610
1607 -> 1610
1608 -> 1610
1609 -> 1610
1610 -> 1610
(in this example, I clear the seconds and nanos only once as they stay zero).
Alternatively to what Holger suggests, you can create a TemporalAdjuster, which will allow you to write something like date.with(nextOrSameMinutes(5)):
public static void main(String[] args) {
for (int i = 0; i <= 10; i++) {
LocalDateTime d = LocalDateTime.of(LocalDate.now(), LocalTime.of(16, i, 0));
LocalDateTime nearest5 = d.with(nextOrSameMinutes(5));
System.out.println(d.toLocalTime() + " -> " + nearest5.toLocalTime());
}
}
public static TemporalAdjuster nextOrSameMinutes(int minutes) {
return temporal -> {
int minute = temporal.get(ChronoField.MINUTE_OF_HOUR);
int nearestMinute = (int) Math.ceil(1d * minute / minutes) * minutes;
int adjustBy = nearestMinute - minute;
return temporal.plus(adjustBy, ChronoUnit.MINUTES);
};
}
Note that this doesn't truncate the seconds/nanos from the original date. If you want that, you can amend the end of the adjuster to:
if (adjustBy == 0
&& (temporal.get(ChronoField.SECOND_OF_MINUTE) > 0 || temporal.get(ChronoField.NANO_OF_SECOND) > 0)) {
adjustBy += 5;
}
return temporal.plus(adjustBy, ChronoUnit.MINUTES)
.with(ChronoField.SECOND_OF_MINUTE, 0)
.with(ChronoField.NANO_OF_SECOND, 0);
I'm struggling to find a command or even a way to find the complete startup time on my Solaris(sun4u sparc SUNW,Netra-T12) box
Solaris
who -b gives me Jun 22 11:09 but no year
same with last reboot | head -n 1
However in my Linux(GNU/Linux x86_64) boxes i'm able to get the full startup time
Linux
who -b gives me 2014-08-23 11:09
Any help?
EDIT
output of apptrace uptime 2>&1
-> uptime -> libc.so.1:int atexit(int (*)() = 0xff3c59ec)
<- uptime -> libc.so.1:atexit()
-> uptime -> libc.so.1:int atexit(int (*)() = 0x10ae8)
<- uptime -> libc.so.1:atexit()
-> uptime -> libc.so.1:char * setlocale(int = 0x6, const char * = 0x10af8 "")
<- uptime -> libc.so.1:setlocale() = 0xfefdb25e
-> uptime -> libc.so.1:char * textdomain(const char * = 0x10afc "SUNW_OST_OSCMD")
<- uptime -> libc.so.1:textdomain() = 0x22b58
-> uptime -> libc.so.1:sysinfo(0x202, 0xffbff97f, 0x1) ** NR
-> uptime -> libc.so.1:void * malloc(size_t = 0x73)
<- uptime -> libc.so.1:malloc() = 0x23158
-> uptime -> libc.so.1:sysinfo(0x202, 0x23158, 0x73) ** NR
-> uptime -> libc.so.1:const char * getexecname(void)
<- uptime -> libc.so.1:getexecname() = 0xffbfffc5
-> uptime -> libc.so.1:strlen(0xffbfffc5, 0x23158, 0x10800) ** NR
-> uptime -> libc.so.1:void * malloc(size_t = 0x82)
<- uptime -> libc.so.1:malloc() = 0x231d8
-> uptime -> libc.so.1:strcpy(0x231d8, 0xffbfffc5, 0xffbfffd4) ** NR
-> uptime -> libc.so.1:char * strrchr(const char * = 0x231d8 "/usr/bin/uptime", int = 0x2f)
<- uptime -> libc.so.1:strrchr() = 0x231e0
-> uptime -> libc.so.1:strlen(0x231d8, 0x2f, 0x231eb) ** NR
-> uptime -> libc.so.1:char * strtok(char * = 0x23158 "sparcv9+vis2 sparcv9+vis sparcv9 sparcv8plus+vis2 sparcv8plus+vis sparcv8plus sparcv8 sparcv8-fsmuld sparcv7 sparc", const char * = 0x10b60 " ")
<- uptime -> libc.so.1:strtok() = 0x23158
-> uptime -> libc.so.1:strcpy(0x231e1, 0x23158, 0x231e1) ** NR
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9+vis2", const char * = 0x10b64 "/")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9+vis2/", const char * = 0xffbfffce "uptime")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:access(0x231d8, 0x1, 0x231f1) ** NR
-> uptime -> libc.so.1:char * strtok(char * = 0x0 <NULL>, const char * = 0x10b84 " ")
<- uptime -> libc.so.1:strtok() = 0x23165
-> uptime -> libc.so.1:strcpy(0x231e1, 0x23165, 0x231f1) ** NR
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9+vis", const char * = 0x10b64 "/")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9+vis/", const char * = 0xffbfffce "uptime")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:access(0x231d8, 0x1, 0x231f0) ** NR
-> uptime -> libc.so.1:char * strtok(char * = 0x0 <NULL>, const char * = 0x10b84 " ")
<- uptime -> libc.so.1:strtok() = 0x23171
-> uptime -> libc.so.1:strcpy(0x231e1, 0x23171, 0x231f0) ** NR
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9", const char * = 0x10b64 "/")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:char * strcat(char * = 0x231e1 "sparcv9/", const char * = 0xffbfffce "uptime")
<- uptime -> libc.so.1:strcat() = 0x231e1
-> uptime -> libc.so.1:access(0x231d8, 0x1, 0x231ec) ** NR
-> uptime -> libc.so.1:execve(0x231d8, 0xffbff9e4, 0xffbff9ec) ** NR
ld.so.1: uptime: warning: /usr/lib/abi/sparcv9/apptrace.so.1: open failed: illegal insecure pathname
ld.so.1: uptime: warning: /usr/lib/abi/sparcv9/apptrace.so.1: audit initialization failure: disabled
3:26pm up 270 day(s), 13:42, 2 users, load average: 2.08, 2.07, 2.07
Here is a hackish way to get the boot time on Solaris 10 under ksh or bash:
perl -le "print scalar localtime hex(\"$(apptrace -v getutxent uptime 2>&1 | nawk '
/ut_type:/ {if($3=="0x2"){boot=1}}
boot == 1 && $0 ~ ".*tv_sec:.*" {sub("0x","",$3);print $3;exit}')\")"
Note that you need to be root to run it on Solaris 10 but not on Solaris 11.
Edit:
Here is a much simpler way that doesn't requires root privileges:
perl -le "print scalar localtime $(kstat -pn system_misc -s boot_time|cut -f 2)"
Can anyone tell me how to set '01/Jan/1999' to a DateTime?
I've tried this but it didn't work:
FormatTime,datein,'01/Jan/1999', dd/MMM/yyyy
GuiControl,, myDate, %datein%
The dateparse function worked but, how am I going to set the value to the datetime?
Here is my code:
Gui, Add, DateTime, vmyDate, dd/MMM/yyyy
newdate := DateParse("Jan 1 1999")
FormatTime, test, % newdate, dd/MMM/yyyy
GuiControl,, myDate, %test%
Lucky for you, someone already wrote a Date Parsing Function for this purpose.
The function takes a large number of date formats and returns them in the YYYYMMDDHH24MISS format. You can then use that value with FormatTime.
Here is some example usage:
newdate := DateParse("Jan 1 1999")
FormatTime, test, % newdate, dd/MMM/yyyy
msgbox % test
DateParse(str) {
static e2 = "i)(?:(\d{1,2}+)[\s\.\-\/,]+)?(\d{1,2}|(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)\w*)[\s\.\-\/,]+(\d{2,4})"
str := RegExReplace(str, "((?:" . SubStr(e2, 42, 47) . ")\w*)(\s*)(\d{1,2})\b", "$3$2$1", "", 1)
If RegExMatch(str, "i)^\s*(?:(\d{4})([\s\-:\/])(\d{1,2})\2(\d{1,2}))?"
. "(?:\s*[T\s](\d{1,2})([\s\-:\/])(\d{1,2})(?:\6(\d{1,2})\s*(?:(Z)|(\+|\-)?"
. "(\d{1,2})\6(\d{1,2})(?:\6(\d{1,2}))?)?)?)?\s*$", i)
d3 := i1, d2 := i3, d1 := i4, t1 := i5, t2 := i7, t3 := i8
Else If !RegExMatch(str, "^\W*(\d{1,2}+)(\d{2})\W*$", t)
RegExMatch(str, "i)(\d{1,2})\s*:\s*(\d{1,2})(?:\s*(\d{1,2}))?(?:\s*([ap]m))?", t)
, RegExMatch(str, e2, d)
f = %A_FormatFloat%
SetFormat, Float, 02.0
d := (d3 ? (StrLen(d3) = 2 ? 20 : "") . d3 : A_YYYY)
. ((d2 := d2 + 0 ? d2 : (InStr(e2, SubStr(d2, 1, 3)) - 40) // 4 + 1.0) > 0
? d2 + 0.0 : A_MM) . ((d1 += 0.0) ? d1 : A_DD) . t1
+ (t1 = 12 ? t4 = "am" ? -12.0 : 0.0 : t4 = "am" ? 0.0 : 12.0) . t2 + 0.0 . t3 + 0.0
SetFormat, Float, %f%
Return, d
}