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v/vlib/time/time.v
2022-05-11 16:55:19 +03:00

403 lines
9.6 KiB
V

module time
pub const (
days_string = 'MonTueWedThuFriSatSun'
long_days = ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday',
'Sunday']
month_days = [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
months_string = 'JanFebMarAprMayJunJulAugSepOctNovDec'
long_months = ['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August',
'September', 'October', 'November', 'December']
// The unsigned zero year for internal calculations.
// Must be 1 mod 400, and times before it will not compute correctly,
// but otherwise can be changed at will.
absolute_zero_year = i64(-292277022399)
seconds_per_minute = 60
seconds_per_hour = 60 * seconds_per_minute
seconds_per_day = 24 * seconds_per_hour
seconds_per_week = 7 * seconds_per_day
days_per_400_years = 365 * 400 + 97
days_per_100_years = 365 * 100 + 24
days_per_4_years = 365 * 4 + 1
days_before = [
0,
31,
31 + 28,
31 + 28 + 31,
31 + 28 + 31 + 30,
31 + 28 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30,
31 + 28 + 31 + 30 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30,
31 + 28 + 31 + 30 + 31 + 30 + 31 + 31 + 30 + 31 + 30 + 31,
]
)
// Time contains various time units for a point in time.
pub struct Time {
pub:
year int
month int
day int
hour int
minute int
second int
microsecond int
unix i64
is_local bool // used to make time.now().local().local() == time.now().local()
}
// FormatDelimiter contains different time formats.
pub enum FormatTime {
hhmm12
hhmm24
hhmmss12
hhmmss24
hhmmss24_milli
hhmmss24_micro
no_time
}
// FormatDelimiter contains different date formats.
pub enum FormatDate {
ddmmyy
ddmmyyyy
mmddyy
mmddyyyy
mmmd
mmmdd
mmmddyy
mmmddyyyy
no_date
yyyymmdd
yymmdd
}
// FormatDelimiter contains different time/date delimiters.
pub enum FormatDelimiter {
dot
hyphen
slash
space
no_delimiter
}
// smonth returns month name abbreviation.
pub fn (t Time) smonth() string {
if t.month <= 0 || t.month > 12 {
return '---'
}
i := t.month - 1
return time.months_string[i * 3..(i + 1) * 3]
}
// unix_time returns Unix time.
[inline]
pub fn (t Time) unix_time() i64 {
return t.unix
}
// unix_time_milli returns Unix time with millisecond resolution.
[inline]
pub fn (t Time) unix_time_milli() i64 {
return t.unix * 1000 + (t.microsecond / 1000)
}
// add returns a new time that duration is added
pub fn (t Time) add(d Duration) Time {
microseconds := i64(t.unix) * 1_000_000 + t.microsecond + d.microseconds()
unix := microseconds / 1_000_000
micro := microseconds % 1_000_000
return unix2(unix, int(micro))
}
// add_seconds returns a new time struct with an added number of seconds.
pub fn (t Time) add_seconds(seconds int) Time {
return t.add(seconds * time.second)
}
// add_days returns a new time struct with an added number of days.
pub fn (t Time) add_days(days int) Time {
return t.add(days * 24 * time.hour)
}
// since returns the time duration elapsed since a given time.
pub fn since(t Time) Duration {
return now() - t
}
// relative returns a string representation of the difference between t
// and the current time.
//
// Sample outputs:
// ```
// // future
// now
// in 5 minutes
// in 1 day
// on Feb 17
// // past
// 2 hours ago
// last Jan 15
// 5 years ago
// ```
pub fn (t Time) relative() string {
znow := now()
mut secs := znow.unix - t.unix
mut prefix := ''
mut suffix := ''
if secs < 0 {
secs *= -1
prefix = 'in '
} else {
suffix = ' ago'
}
if secs < time.seconds_per_minute / 2 {
return 'now'
}
if secs < time.seconds_per_hour {
m := secs / time.seconds_per_minute
if m == 1 {
return '${prefix}1 minute$suffix'
}
return '$prefix$m minutes$suffix'
}
if secs < time.seconds_per_hour * 24 {
h := secs / time.seconds_per_hour
if h == 1 {
return '${prefix}1 hour$suffix'
}
return '$prefix$h hours$suffix'
}
if secs < time.seconds_per_hour * 24 * 7 {
d := secs / time.seconds_per_hour / 24
if d == 1 {
return '${prefix}1 day$suffix'
}
return '$prefix$d days$suffix'
}
if secs < time.seconds_per_hour * 24 * 365 {
if prefix == 'in ' {
return 'on $t.md()'
}
return 'last $t.md()'
}
y := secs / time.seconds_per_hour / 24 / 365
if y == 1 {
return '${prefix}1 year$suffix'
}
return '$prefix$y years$suffix'
}
// relative_short returns a string saying how long ago a time occured as follows:
// 0-30 seconds: `"now"`; 30-60 seconds: `"1m"`; anything else is rounded to the
// nearest minute, hour, day, or year
//
// Sample outputs:
// ```
// // future
// now
// in 5m
// in 1d
// // past
// 2h ago
// 5y ago
// ```
pub fn (t Time) relative_short() string {
znow := now()
mut secs := znow.unix - t.unix
mut prefix := ''
mut suffix := ''
if secs < 0 {
secs *= -1
prefix = 'in '
} else {
suffix = ' ago'
}
if secs < time.seconds_per_minute / 2 {
return 'now'
}
if secs < time.seconds_per_hour {
m := secs / time.seconds_per_minute
if m == 1 {
return '${prefix}1m$suffix'
}
return '$prefix${m}m$suffix'
}
if secs < time.seconds_per_hour * 24 {
h := secs / time.seconds_per_hour
if h == 1 {
return '${prefix}1h$suffix'
}
return '$prefix${h}h$suffix'
}
if secs < time.seconds_per_hour * 24 * 365 {
d := secs / time.seconds_per_hour / 24
if d == 1 {
return '${prefix}1d$suffix'
}
return '$prefix${d}d$suffix'
}
y := secs / time.seconds_per_hour / 24 / 365
if y == 1 {
return '${prefix}1y$suffix'
}
return '$prefix${y}y$suffix'
}
// day_of_week returns the current day of a given year, month, and day,
// as an integer.
pub fn day_of_week(y int, m int, d int) int {
// Sakomotho's algorithm is explained here:
// https://stackoverflow.com/a/6385934
t := [0, 3, 2, 5, 0, 3, 5, 1, 4, 6, 2, 4]
mut sy := y
if m < 3 {
sy = sy - 1
}
return (sy + sy / 4 - sy / 100 + sy / 400 + t[m - 1] + d - 1) % 7 + 1
}
// day_of_week returns the current day as an integer.
pub fn (t Time) day_of_week() int {
return day_of_week(t.year, t.month, t.day)
}
// weekday_str returns the current day as a string 3 letter abbreviation.
pub fn (t Time) weekday_str() string {
i := t.day_of_week() - 1
return time.long_days[i][0..3]
}
// long_weekday_str returns the current day as a string.
pub fn (t Time) long_weekday_str() string {
i := t.day_of_week() - 1
return time.long_days[i]
}
// is_leap_year checks if a given a year is a leap year.
pub fn is_leap_year(year int) bool {
return (year % 4 == 0) && (year % 100 != 0 || year % 400 == 0)
}
// days_in_month returns a number of days in a given month.
pub fn days_in_month(month int, year int) ?int {
if month > 12 || month < 1 {
return error('Invalid month: $month')
}
extra := if month == 2 && is_leap_year(year) { 1 } else { 0 }
res := time.month_days[month - 1] + extra
return res
}
// debug returns detailed breakdown of time (`Time{ year: YYYY month: MM day: dd hour: HH: minute: mm second: ss microsecond: micros unix: unix }`)
pub fn (t Time) debug() string {
return 'Time{ year: ${t.year:04} month: ${t.month:02} day: ${t.day:02} hour: ${t.hour:02} minute: ${t.minute:02} second: ${t.second:02} microsecond: ${t.microsecond:06} unix: ${t.unix:07} }'
}
// A lot of these are taken from the Go library.
pub type Duration = i64
pub const (
nanosecond = Duration(1)
microsecond = Duration(1000 * nanosecond)
millisecond = Duration(1000 * microsecond)
second = Duration(1000 * millisecond)
minute = Duration(60 * second)
hour = Duration(60 * minute)
infinite = Duration(i64(9223372036854775807))
)
// nanoseconds returns the duration as an integer number of nanoseconds.
pub fn (d Duration) nanoseconds() i64 {
return i64(d)
}
// microseconds returns the duration as an integer number of microseconds.
pub fn (d Duration) microseconds() i64 {
return i64(d) / time.microsecond
}
// milliseconds returns the duration as an integer number of milliseconds.
pub fn (d Duration) milliseconds() i64 {
return i64(d) / time.millisecond
}
// The following functions return floating point numbers because it's common to
// consider all of them in sub-one intervals
// seconds returns the duration as a floating point number of seconds.
pub fn (d Duration) seconds() f64 {
sec := d / time.second
nsec := d % time.second
return f64(sec) + f64(nsec) / time.second
}
// minutes returns the duration as a floating point number of minutes.
pub fn (d Duration) minutes() f64 {
min := d / time.minute
nsec := d % time.minute
return f64(min) + f64(nsec) / time.minute
}
// hours returns the duration as a floating point number of hours.
pub fn (d Duration) hours() f64 {
hr := d / time.hour
nsec := d % time.hour
return f64(hr) + f64(nsec) / time.hour
}
// str pretty prints the duration
//
// ```
// h:m:s // 5:02:33
// m:s.mi<s> // 2:33.015
// s.mi<s> // 33.015s
// mi.mc<ms> // 15.007ms
// mc.ns<ns> // 7.234us
// ns<ns> // 234ns
// ```
pub fn (d Duration) str() string {
if d == time.infinite {
return 'inf'
}
mut t := i64(d)
hr := t / time.hour
t -= hr * time.hour
min := t / time.minute
t -= min * time.minute
sec := t / time.second
t -= sec * time.second
ms := t / time.millisecond
t -= ms * time.millisecond
us := t / time.microsecond
t -= us * time.microsecond
ns := t
if hr > 0 {
return '$hr:${min:02}:${sec:02}'
}
if min > 0 {
return '$min:${sec:02}.${ms:03}'
}
if sec > 0 {
return '${sec}.${ms:03}s'
}
if ms > 0 {
return '${ms}.${us:03}ms'
}
if us > 0 {
return '${us}.${ns:03}us'
}
return '${ns}ns'
}
// offset returns time zone UTC offset in seconds.
pub fn offset() int {
t := utc()
local := t.local()
return int(local.unix - t.unix)
}