Sync

Task/Date-manipulation/AWK/date-manipulation.awk

@@ -0,0 +1,18 @@
+# syntax: GAWK -f DATE_MANIPULATION.AWK
+BEGIN {
+    fmt = "%a %Y-%m-%d %H:%M:%S %Z" # DAY YYYY-MM-DD HH:MM:SS TZ
+    split("March 7 2009 7:30pm EST",arr," ")
+    M = (index("JanFebMarAprMayJunJulAugSepOctNovDec",substr(arr[1],1,3)) + 2) / 3
+    D = arr[2]
+    Y = arr[3]
+    hhmm = arr[4]
+    hh = substr(hhmm,1,index(hhmm,":")-1) + 0
+    mm = substr(hhmm,index(hhmm,":")+1,2) + 0
+    if (hh == 12 && hhmm ~ /am/) { hh = 0 }
+    else if (hh < 12 && hhmm ~ /pm/) { hh += 12 }
+    time = mktime(sprintf("%d %d %d %d %d %d",Y,M,D,hh,mm,0))
+    printf("time:    %s\n",strftime(fmt,time))
+    time += 12*60*60
+    printf("+12 hrs: %s\n",strftime(fmt,time))
+    exit(0)
+}

Task/Date-manipulation/UNIX-Shell/date-manipulation.sh

@@ -1 +1,3 @@
-date -d 'March 7 2009 7:30pm EST +12 hours'
+epoch=$(date -d 'March 7 2009 7:30pm EST +12 hours' +%s)
+date -d @$epoch
+TZ=Asia/Shanghai date -d @$epoch