Bug: Possible Time Calculation Issue

[jaswrks]

Referencing internal/private ticket: http://jas.xyz/2f8st76
This issue may be related to the new HTML notes in the latest release.
Not yet confirmed.

[raamdev]

Referencing additional details from the internal ticket:

• Cache Expiration Time was set to 28 days.
• When viewing the HTML source for a cached page, the expiration date has a year of 2063:

See screenshot:

[renzms]

@raamdev

Unable to reproduce error

WordPress Version: 4.6.1
Current WordPress Theme: Twenty Sixteen version 1.3
Theme Author: the WordPress team - https://wordpress.org/
Theme URI: https://wordpress.org/themes/twentysixteen/
Active Plugins: Comet Cache Pro Version 161119

• set Cache Expiration time to 28 days

• visited front end for html notes

Results
From and including: Saturday, 26 November 2016
To, but not including Saturday, 24 December 2016
Result: 28 days

---

Notes based on information from internal ticket

Referencing internal/private ticket: http://jas.xyz/2f8st76

Cache Expiration time: 28 Days

Based on first screenshot:

From: Tuesday, 22 November 2016, 17:53:00
To: Monday, 15 October 2063, 11:47:00

The duration is 17,127 days, 17 hours, 54 minutes and 0 seconds or excluding the exact time but not including the day of : 17,128 days

Based on second set of screenshots

Cache Expiration time: 21 Days

From: Wednesday, 23 November 2016, 23:12:00
To: Wednesday, 17 October 2063, 22:24:00

The duration is 17,128 days, 23 hours, 12 minutes and 0 seconds or excluding the exact time but not including the day of : 17,129 days

Looks like the error on customer's test site is always adding 17,128 days give or take a couple hours. Could it be a possible error on customer's server host time? Or a conflict with another plugin?

[raamdev]

@renzms Thank you for the additional testing.

@jaswsinc Had you done any code review prior to posting this issue? Would you like me to leave this open for further research or do you feel this was most likely user-specific?

[jaswrks]

Yes, I'd like to leave this open for further research. My best guess at the moment is that this occurs whenever you also enable the load average check in Comet Cache.

Notice that cache_max_age is forced to 0 here, leading to an invalid time calculation later: https://github.com/websharks/comet-cache-pro/blob/161119/src/includes/traits/Ac/ObUtils.php#L215

[raamdev]

@renzms Can you try reproducing this with the Load Average Check enabled? See Comet Cache → Plugin Options → Cache Expiration Time → Disable Cache Expiration If Server Load Average is High?

[renzms]

@raamdev

Confirmed able to reproduce Bug

WordPress Version: 4.7
Current WordPress Theme: Twenty Sixteen version 1.3
Theme Author: the WordPress team - https://wordpress.org/
Theme URI: https://wordpress.org/themes/twentysixteen/
Active Plugins: Comet Cache Pro Version 161221

At lower Server Load Average numbers, it causes the invalid time calculation.

Correct Calculation at Server Load Average .70

Set at 28Days

Front end HTML notes

Incorrect Calculation at Server Load Average .01

Set at 28Days

Front end HTML notes