mirror of
https://github.com/VictoriaMetrics/VictoriaMetrics.git
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123 lines
3.0 KiB
Go
123 lines
3.0 KiB
Go
package promutils
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import (
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"fmt"
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"strconv"
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"strings"
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"time"
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)
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// ParseTime parses time s in different formats.
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//
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// See https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#timestamp-formats
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//
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// It returns unix timestamp in seconds.
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func ParseTime(s string) (float64, error) {
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currentTimestamp := float64(time.Now().UnixNano()) / 1e9
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return ParseTimeAt(s, currentTimestamp)
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}
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// ParseTimeAt parses time s in different formats, assuming the given currentTimestamp.
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//
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// See https://docs.victoriametrics.com/Single-server-VictoriaMetrics.html#timestamp-formats
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//
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// It returns unix timestamp in seconds.
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func ParseTimeAt(s string, currentTimestamp float64) (float64, error) {
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if s == "now" {
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return currentTimestamp, nil
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}
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sOrig := s
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tzOffset := float64(0)
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if len(sOrig) > 6 {
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// Try parsing timezone offset
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tz := sOrig[len(sOrig)-6:]
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if (tz[0] == '-' || tz[0] == '+') && tz[3] == ':' {
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isPlus := tz[0] == '+'
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hour, err := strconv.ParseUint(tz[1:3], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("cannot parse hour from timezone offset %q: %w", tz, err)
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}
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minute, err := strconv.ParseUint(tz[4:], 10, 64)
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if err != nil {
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return 0, fmt.Errorf("cannot parse minute from timezone offset %q: %w", tz, err)
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}
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tzOffset = float64(hour*3600 + minute*60)
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if isPlus {
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tzOffset = -tzOffset
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}
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s = sOrig[:len(sOrig)-6]
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}
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}
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s = strings.TrimSuffix(s, "Z")
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if len(s) > 0 && (s[len(s)-1] > '9' || s[0] == '-') || strings.HasPrefix(s, "now") {
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// Parse duration relative to the current time
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s = strings.TrimPrefix(s, "now")
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d, err := ParseDuration(s)
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if err != nil {
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return 0, err
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}
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if d > 0 {
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d = -d
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}
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return currentTimestamp + float64(d)/1e9, nil
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}
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if len(s) == 4 {
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// Parse YYYY
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t, err := time.Parse("2006", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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if !strings.Contains(sOrig, "-") {
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// Parse the timestamp in seconds
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return strconv.ParseFloat(sOrig, 64)
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}
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if len(s) == 7 {
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// Parse YYYY-MM
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t, err := time.Parse("2006-01", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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if len(s) == 10 {
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// Parse YYYY-MM-DD
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t, err := time.Parse("2006-01-02", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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if len(s) == 13 {
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// Parse YYYY-MM-DDTHH
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t, err := time.Parse("2006-01-02T15", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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if len(s) == 16 {
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// Parse YYYY-MM-DDTHH:MM
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t, err := time.Parse("2006-01-02T15:04", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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if len(s) == 19 {
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// Parse YYYY-MM-DDTHH:MM:SS
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t, err := time.Parse("2006-01-02T15:04:05", s)
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if err != nil {
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return 0, err
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}
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return tzOffset + float64(t.UnixNano())/1e9, nil
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}
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// Parse RFC3339
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t, err := time.Parse(time.RFC3339, sOrig)
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if err != nil {
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return 0, err
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}
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return float64(t.UnixNano()) / 1e9, nil
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}
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