Yeah , I love uptime.exe the most. It provides a detailed logs of your uptime history. The catch is: Uptime relies on your event logs, so you might want to increase your event logs size to get a longer history period.
This is one example of detailed uptime.exe report. It even works well on other network machine.
======================================================================
D:\>uptime -a
Uptime Report for: \\E2W2KPRO
Current OS: Microsoft Windows 2000, Service Pack 1, Uniprocessor Free.
Time Zone: Pacific Standard Time
System Events as of 12/16/2000 4:45:11 AM:
Date:      Time:        Event:               Comment:
---------- -----------  -------------------  ----------------------------------
10/25/2000  1:59:56 AM  Boot
10/25/2000  7:22:19 PM  Shutdown             Prior uptime:0d 17h:22m:23s
10/25/2000  7:23:35 PM  Boot                 Prior downtime:0d 0h:1m:16s
10/26/2000  1:45:25 AM  Shutdown             Prior uptime:0d 6h:21m:50s
10/26/2000  1:46:22 AM  Boot                 Prior downtime:0d 0h:0m:57s
10/26/2000  1:59:47 AM  Shutdown             Prior uptime:0d 0h:13m:25s
10/26/2000  2:00:59 AM  Boot                 Prior downtime:0d 0h:1m:12s
10/26/2000  2:10:12 AM  Shutdown             Prior uptime:0d 0h:9m:13s
10/26/2000  2:11:03 AM  Boot                 Prior downtime:0d 0h:0m:51s
10/26/2000  2:39:17 AM  Shutdown             Prior uptime:0d 0h:28m:14s
10/26/2000  2:40:14 AM  Boot                 Prior downtime:0d 0h:0m:57s
10/26/2000  3:05:47 AM  Shutdown             Prior uptime:0d 0h:25m:33s
10/26/2000  3:06:48 AM  Boot                 Prior downtime:0d 0h:1m:1s
10/26/2000  3:14:25 AM  Shutdown             Prior uptime:0d 0h:7m:37s
10/26/2000  3:15:25 AM  Boot                 Prior downtime:0d 0h:1m:0s
10/26/2000  3:37:36 AM  Shutdown             Prior uptime:0d 0h:22m:11s
10/26/2000  3:39:09 AM  Boot                 Prior downtime:0d 0h:1m:33s
10/26/2000  3:47:25 AM  Shutdown             Prior uptime:0d 0h:8m:16s
10/26/2000  3:48:25 AM  Boot                 Prior downtime:0d 0h:1m:0s
10/26/2000  4:30:20 AM  Shutdown             Prior uptime:0d 0h:41m:55s
10/26/2000  4:31:16 AM  Boot                 Prior downtime:0d 0h:0m:56s
10/26/2000  8:50:17 PM  Shutdown             Prior uptime:0d 16h:19m:1s
10/26/2000  8:51:11 PM  Boot                 Prior downtime:0d 0h:0m:54s
10/26/2000  9:10:40 PM  Boot
10/26/2000  9:25:23 PM  Bluescreen           STOP 0x000000d1
10/26/2000  9:25:22 PM  Boot
10/27/2000 12:25:58 AM  Bluescreen           STOP 0x000000d1
10/27/2000 12:25:57 AM  Boot
10/29/2000  4:49:32 AM  Shutdown
10/29/2000  4:50:23 AM  Boot                 Prior downtime:0d 0h:0m:51s
10/29/2000 12:27:06 PM  Boot
10/30/2000  8:48:59 PM  Shutdown
10/30/2000  8:49:47 PM  Boot                 Prior downtime:0d 0h:0m:48s
10/30/2000  8:58:23 PM  Shutdown             Prior uptime:0d 0h:8m:36s
10/30/2000  8:59:11 PM  Boot                 Prior downtime:0d 0h:0m:48s
10/30/2000  9:04:24 PM  Shutdown             Prior uptime:0d 0h:5m:13s
10/30/2000  9:05:15 PM  Boot                 Prior downtime:0d 0h:0m:51s
10/30/2000  9:10:03 PM  Shutdown             Prior uptime:0d 0h:4m:48s
10/30/2000  9:10:59 PM  Boot                 Prior downtime:0d 0h:0m:56s
10/30/2000  9:13:53 PM  Shutdown             Prior uptime:0d 0h:2m:54s
10/30/2000  9:14:52 PM  Boot                 Prior downtime:0d 0h:0m:59s
10/31/2000  6:28:00 PM  Shutdown             Prior uptime:0d 21h:13m:8s
10/31/2000  6:45:17 PM  Boot                 Prior downtime:0d 0h:17m:17s
10/31/2000  6:47:14 PM  Shutdown             Prior uptime:0d 0h:1m:57s
10/31/2000  6:53:27 PM  Boot                 Prior downtime:0d 0h:6m:13s
10/31/2000  6:55:59 PM  Shutdown             Prior uptime:0d 0h:2m:32s
10/31/2000  6:56:50 PM  Boot                 Prior downtime:0d 0h:0m:51s
 11/2/2000  5:19:59 PM  Boot
 11/2/2000  5:44:11 PM  Shutdown
 11/2/2000  6:04:57 PM  Boot                 Prior downtime:0d 0h:20m:46s
 11/2/2000 10:48:20 PM  Boot
 11/3/2000  6:54:41 PM  Boot
 11/4/2000  3:28:15 PM  Shutdown             Prior uptime:0d 20h:33m:34s
 11/4/2000  3:28:58 PM  Boot                 Prior downtime:0d 0h:0m:43s
 11/5/2000  3:40:04 AM  Shutdown             Prior uptime:0d 12h:11m:6s
 11/5/2000  3:48:17 AM  Boot                 Prior downtime:0d 0h:8m:13s
 11/5/2000  3:50:37 AM  Boot
 11/5/2000  3:57:14 AM  Boot
 11/5/2000  4:42:19 AM  Boot
 11/5/2000  4:28:01 PM  Boot
 11/5/2000  8:54:18 PM  Boot
 11/5/2000 11:37:10 PM  Boot
 11/6/2000  3:12:39 AM  Boot
 11/6/2000  5:50:27 AM  Boot
 11/6/2000  5:59:57 AM  Boot
 11/7/2000  7:30:16 PM  Boot
11/12/2000  4:04:19 AM  Shutdown             Prior uptime:4d 8h:34m:3s
11/12/2000  4:05:35 AM  Boot                 Prior downtime:0d 0h:1m:16s
11/12/2000  4:07:12 AM  Shutdown             Prior uptime:0d 0h:1m:37s
11/12/2000  4:08:25 AM  Boot                 Prior downtime:0d 0h:1m:13s
11/13/2000  9:48:27 PM  Boot
11/13/2000 10:59:25 PM  Shutdown
11/13/2000 11:00:16 PM  Boot                 Prior downtime:0d 0h:0m:51s
11/13/2000 11:04:02 PM  Shutdown             Prior uptime:0d 0h:3m:46s
11/13/2000 11:04:59 PM  Boot                 Prior downtime:0d 0h:0m:57s
11/15/2000  5:13:44 AM  Boot
11/15/2000  8:06:43 AM  Shutdown
11/15/2000  8:07:55 AM  Boot                 Prior downtime:0d 0h:1m:12s
11/16/2000 10:02:49 AM  Shutdown             Prior uptime:1d 1h:54m:54s
11/16/2000 10:03:49 AM  Boot                 Prior downtime:0d 0h:1m:0s
11/16/2000 10:12:50 PM  Bluescreen           STOP 0x0000001e
11/16/2000 10:12:50 PM  Boot
11/16/2000 10:19:53 PM  Shutdown
11/16/2000 10:20:53 PM  Boot                 Prior downtime:0d 0h:1m:0s
11/19/2000  3:49:30 PM  Bluescreen           STOP 0x0000001e
11/19/2000  3:49:30 PM  Boot
11/19/2000  3:52:45 PM  Bluescreen           STOP 0x0000001e
11/19/2000  3:52:44 PM  Boot
11/20/2000  3:07:37 AM  Boot
11/20/2000  4:06:01 AM  Boot
11/20/2000  6:29:26 PM  Shutdown             Prior uptime:0d 14h:23m:25s
11/20/2000  6:40:38 PM  Boot                 Prior downtime:0d 0h:11m:12s
11/20/2000  7:18:14 PM  Boot
11/20/2000 10:52:30 PM  Boot
11/21/2000  4:33:06 AM  Boot
11/27/2000  1:53:05 AM  Shutdown
11/27/2000  1:53:15 AM  Boot                 Prior downtime:0d 0h:0m:10s
11/27/2000  2:21:08 AM  Shutdown             Prior uptime:0d 0h:27m:53s
11/27/2000  2:22:00 AM  Boot                 Prior downtime:0d 0h:0m:52s
11/28/2000  2:15:34 AM  Boot
11/28/2000  8:51:18 AM  Shutdown
11/28/2000  8:52:44 AM  Boot                 Prior downtime:0d 0h:1m:26s
 12/3/2000  5:46:39 AM  Shutdown             Prior uptime:4d 20h:53m:55s
 12/3/2000  5:47:57 AM  Boot                 Prior downtime:0d 0h:1m:18s
 12/3/2000  8:25:38 AM  Boot
 12/3/2000  2:57:02 PM  Shutdown
 12/3/2000  2:58:13 PM  Boot                 Prior downtime:0d 0h:1m:11s
 12/4/2000  4:00:43 AM  Boot
 12/4/2000  7:06:01 AM  Boot
 12/7/2000  2:55:10 PM  Shutdown             Prior uptime:3d 7h:49m:9s
 12/7/2000  2:56:00 PM  Boot                 Prior downtime:0d 0h:0m:50s
 12/7/2000  3:05:59 PM  Shutdown             Prior uptime:0d 0h:9m:59s
 12/7/2000  3:07:06 PM  Boot                 Prior downtime:0d 0h:1m:7s
 12/7/2000  5:47:45 PM  Shutdown             Prior uptime:0d 2h:40m:39s
 12/7/2000  5:54:46 PM  Boot                 Prior downtime:0d 0h:7m:1s
 12/7/2000 11:46:26 PM  Shutdown             Prior uptime:0d 5h:51m:40s
 12/7/2000 11:47:22 PM  Boot                 Prior downtime:0d 0h:0m:56s
Current System Uptime: 8 day(s), 4 hour(s), 58 minute(s), 16 second(s)
-------------------------------------------------------------------------------
Since 10/25/2000:
                 Total Reboots: 72
     Mean Time Between Reboots: 0.72 days
             Total Bluescreens: 5
    Total Application Failures: 0
-------------------------------------------------------------------------------
Since 12/4/2000:
           System Availability: 99.9422%
                  Total Uptime: 11d 21h:29m:16s
                Total Downtime: 0d 0h:9m:54s
                 Total Reboots: 5
     Mean Time Between Reboots: 2.38 days
             Total Bluescreens: 0
    Total Application Failures: 0
Notes:
12/4/2000 is the earliest date in the event log where
sufficient information is recorded to calculate availability.
eRr