nwmfiles.go

package main

import (
    "fmt"
    "time"

    "github.com/fhs/go-netcdf/netcdf"
)

func main() {
    fileset()
}

func fileset() {
    start := time.Now()
    s := start.AddDate(0, 0, -3)
    e := start.AddDate(0, 0, -1)

    for rd := rangeDate(s, e); ; {
        date := rd()
        if date.IsZero() {
            break
        }
        d := fmt.Sprint(date.Format("20060102"))
        for i := 0; i <= 23; i++ {
            t := fmt.Sprintf("%02d", i)
            fmt.Printf("https://storage.cloud.google.com/national-water-model/nwm.%s/analysis_assim/nwm.t%sz.analysis_assim.channel_rt.tm00.conus.nc\n", d, t)
        }
    }

}

func rangeDate(start, end time.Time) func() time.Time {
    y, m, d := start.Date()
    start = time.Date(y, m, d, 0, 0, 0, 0, time.UTC)
    y, m, d = end.Date()
    end = time.Date(y, m, d, 0, 0, 0, 0, time.UTC)

    return func() time.Time {
        if start.After(end) {
            return time.Time{}
        }
        date := start
        start = start.AddDate(0, 0, 1)
        return date
    }
}